How about blending in a little tofu? Or sprinkle in some protein powder.

My sister mixes cooked brown rice in her smoothies. I think the texture is a little weird but you could try it and see.

you can try a few tablespoons of bran, or Oatmeal that has been whizzed in the blender, we use a mix of pumpkin and flax seeds that have been ground in a blender, however banana is very creamy so hides some of the grainyness of these. I would look at adding some fruits or veggies that have a bit more fibre.
Here is a nice recipe for Chamomile Peach and Ginger smoothie that contains Bran and no banana
1 chamomile tea bag
1/2 cup low-fat or soy milk
1 peach, skinned, stone removed, or tinned equivelant
1 tsp grated fresh ginger
1-2 tsp wheatgerm (optional)
pinch of cinnamon
make tea, using only 1/3 cup of water, remove bag and blend the water with all other ingredients till smooth.

I've tried the oatmeal smoothie linked in the editor's comments, and it is very good. I have also used flax seeds in mine, but I think that maybe already ground flax would be better.

I bet natural peanut butter, oatmeal, soy milk, and some semi-sweet chocolate chips would be really good too.

hemp seeds make ours filling & add taste really good.

i second using whole milk yogurt, and adding protein powder. I usually get the hemp kind at whole foods or similar places, and you might be able to find it somewhere, but you can get dairy or soy based ones too. Also adding some silken tofu can do wonders for smoothies!

SPINACH is a great addition to smoothies!

Just saw a show on breakfasts and it was all about the porridge oats. He used banana but said on the show that any fruit would be good.

http://www.channel4.com/food/recipes/chefs/hugh-fearnley-whittingstall/banana-and-oat-thickie-recipe_p_1.html

I know it sound crazy but you can add beans to your smoothies. Black beans and cocoa powder can make for an awesome chocolate smoothie but you can use any beans you want. Google some recipes:) A bag of dried organic beans is cheaper than any protein powder I've come across, and since they are cheap you can experiment without blowing a ton of money!

I would recommend using Greek yogurt (I use full-fat) to thicken the smoothie up a bit. You might also want to try a scoop of nut butter--I prefer almond butter for smoothies.

@keepthecheeze--I think that's a great suggestion. I'm thinking of the sweetened red bean paste used in many Korean desserts and in red bean bubble tea. Tahini could work, too, since it's delicious in halva.

Low- or non-fat cottage cheese adds a lot of protein (and thus satisfaction) for very few calories.

Wheat germ or wheat bran, cooked rice, cooked cream of wheat or cream of rice might help make it more substantial.

You can always add some protein powder and for extra fiber use flax seed, which also contains healthy omega-3 fatty acids.

here is a smoothie recipe with plenty of fiber:
http://crumpetsandcakes.blogspot.com/2010/09/welcome-autumn.html

Wheat germ and protein powder. You should be able to find those anywhere. I add protein powder to my toddler's bedtime milk. Helps him sleep through the night!

Wheat bran, oat bran, ground oatmeal, ground flaxseed, nut butters-even tahini make nice additions and provide good texture.

I've never gotten the notion that a smoothi is a meal -- especially breakfast. If you look at the ingredients they're essentially a dessert. They're full of sugar; even without adding an additional sweetener, all that fruit consists of fairly simple carbs that don't stay with you long.

So, to make it more filling you need to add some protein or some fat or, preferably, both. The greek yogurt is a good idea (unsweetened). An even better idea: eat a hard boiled egg or two with your smoothie.

try chia seeds. you can order them online (i usually order from nutsonline). they absorb liquid helping to keep you hydrated longer and are a complete protein. i never make a smoothie without them. plus, they are cheap for your college budget and completely tasteless. wow, i sound like an advertisement but they are seriously my favorite food discovery in years.

I put Grape Nuts in my smoothies. It sounds weird but they soften up nicely and end up just a smoosh crunchy, and they add fiber and staying power.

I add a handful of raw almonds - you want to blend them and the liquid (milk, usually, for me at least) by themselves for a minute or two to get them as ground as you can, before you put in the fruit and what have you - adds protein, good flavor, and definitely makes the smoothie heartier.

Ground oats do work great for me; I just toss a handful in there dry. I like having texture in my smoothies so I also love using ground flax, or any kind of cereal/granola, or nut butters. I don't buy Nutrigrain bars lately, but I used to throw a whole one in there.

I'm intrigued by the black bean/cocoa powder concept.

i had the most amazing smoothie yesterday my mom got me for getting my wisdom teeth out. there is a shop that puts in add-ins like protein powder or multi vitamin powder or tofu ... they have an amazing guava/strawberry smoothie but the worker traded out the strawberries for a peach since the seeds would have bothered my teeth and it was so tasty. you can buy Kern's guava nectar anywhere and it gives a tropical flavor to smoothies. also a 1/2 cup of light coconut milk and frozen pineapple chunks is delish too :)

I think someone mentioned it above, but I always add a spoonful (or two) of cottage cheese to my smoothies. You can't taste it, especially if you are already adding yogurt and the added protein helps me last til lunch. Yum!

Add peanut butter!

My standard smoothie is low-fat plain yogurt, a banana, peanut butter, and maybe a little nutella or cocoa powder.

The PB adds fat, protein, and fiber to what are otherwise very liquidy/sugary ingredients.

For a little extra fiber try blending a small handful of Cheerios (or generic equivalent) into dust before adding your other ingredients.

PROTEIN POWDER! You need to up the protein -- it balances carbs and keeps your blood sugar steady, longer. Switching to Greek yogurt will help too. As others have mentioned, smoothies tend to be really high in sugar. So, watch the fruit and up the protein and you'll be good.

Freshly ground flax seeds are be a great source of fiber. Good for your skin, too.

Be careful with the protein powder, Consumer Reports just released an article about them and all of the ones they tested had elevated levels of heavy metals. Sounds tastey, right?

I'd try the cottage cheese trick, or switching to greek yogurt. It's shocking how much more protein is in it than in regular yogurt. Personally, though, if I drink breakfast I'm starving again in an hour regardless of what's in it. It might turn out that you're that way, too. If so, try a handful of nuts and some dried fruit just before you normally start to get hungry. It usually staves off the need for lunch by a couple of hours for me.

I heard about that heavy metal/protein powder thing too. Scary.

Love the idea of beans or cottage cheese! Gonna have to try this.

Cooked sweet potato. it goes great with maple syrup and cinnamon!

I use ground chia seeds too in my smoothies. They make it super thick too, which is good if you're not using bananas. They also have a TON of omega 3's. They are a super food.

nuts or nut butter! i add peanut butter (crunchy, but i like the texture) or almonds (you can grind them beforehand, but again, i don't mind the texture in smoothies). it's really good with raw cacao nibs, if you can find them. i also add spinach - you can't taste it, and it's definitely an addition of fiber.

My favorite smoothie:

1/2 c frozen blue berries
1/2 banana or strawberries
1 scoop vega (http://www.brendanbrazier.com/vega/index.html)
2 tsp cocoa
1 tbsp almond butter

That keeps me going for at least four hours. Vega isn't a protein powder, if's ground up whole foods, and two servings gives you your entire RDI of everything- fiber, essential fatty acids, protein, vitamins and minerals. Also, it's all plant ingredients, so you get your chlorophyll and phytonutrients too. As a result of all this, it's very, very filling.

Chia seeds, soaked oatmeal (I always have a bowl of oats in the fridge soaking in milk), silken tofu, soaked nuts. I don't think I have mentioned.

I read once that adding a teaspoon of olive oil to a morning smoothie can help you feel fuller for longer.

Don't you love that when you leave half of your own comment out?

** I don't think I have mentioned anything anyone else hasn't already said except:

I second the chia seed idea although IME they don't really do all that much for being filling. Nutritionally, however, they are as good as it gets.
How about just having a bowl of oatmeal or whole wheat toast or something with your smoothie? I have no rules about breakfast whatsoever other than keeping it reasonably healthy most of the time, but even so I have to remind myself that it IS ok to have a smoothie AND something else if I'm that hungry.

I thrive on smoothies and I am allergic to all manner of odd things, so I have to make some concessions, like not using most protein supplements. I never use low-fat yogurt, it just doesn't do it for me.

Hemp is awesome. I have only used a simple supplement of pre-ground hemp, cane sugar, and vanilla, but it's been great. My teenager puts it in apple cider for a fast meal. It keeps well in the fridge. Great fibre, good protein.

Almonds are really good, and keep well in the fridge or not. Put a handful in a glass of water in the fridge overnight and then grind them into your smoothie in the morning.

Flax seeds should be ground right before using them, and keep best in the fridge. You can soak them in a few tablespoons of water or soy milk before adding them.

Oats are high-protein for a grain and I find that I like them toasted and then run through a chopper like the Magic Bullet. Something about the toasting seems to make them less chalky, to me.

For fruit additives, I love mango instead of banana. You can purchase frozen chunks and give them a quick thaw or put them in the fridge overnight. My standard fruit component is a cup of mixed, frozen berries and a whole banana--don't skimp on the fruit, it's got such great value. Berries are high in silicon in addition to all the other good stuff, and it'll make your hair and nails strong and shiny. The frozen fruit thickens up the smoothie really nicely.

(If I had a high-powered blender, I'd be tempted to try soaked dates. I love dates. Dates solve everything.)

1/4 - 1/2 c pumpkin, canned or fresh baked. It is amazingly high in fiber, loaded with nutrients, seasonal ;-) and the flavor is great with applesauce and other fruits.

I use Chia Seeds. They are a super food. Packed with Omega 3's, protein and fiber. And they are filling as they actually expand in your stomach. A couple of tablespoons of these added into your smoothie would probably give you the fiber you need, protein to sustain your blood suger and will leave you feeling fulfilled instead of hungry. Check out this site for good facts about Chia Seeds. http://www.thechiaseed.com/

You said you live in a small community so I am guessing these wouldn't be availabe close to you but once you are able to purchase them they last a long time in the fridge.

I make my smoothies more filling with flax seed oil

This probably falls under the "hard to find" category, but psyllium husk is great in smoothies (and filling, too!).

I second the spinach suggestion. You can't taste it and it bulks up the smoothie and adds lots of fiber without adding calories.

My favorite smoothie recipe is:
1.5 cups spinach
1 tbsp peanut butter
Fruit (usually a banana but since that's not an option for you, I also do a lot of frozen mango or raspberries.)
1 cup skim milk
Ice

Wow! I knew you all would come up with some great stuff for me!

I'm interested in the chia nut- looking into that more! Also, if I go the spinach route (I think I'm going to try some new recipes this week), what kind do I buy? Fresh? Frozen?
Peanut butter and sweet potatoes both sound awesome as well!
Thanks again for the help- I'm excited to try some new things!

I used to always do tofu. Now I'm not sure I want that much daily soy.

I always add some wheat germ. I also sometimes have a half a cup of dry cereal on the side so that I have something to chew. I think that the chewing makes me more satisfied than anything.

I like to throw in a little (like 1/4 cup) bran or flax cereal. If you have a good blender, it'll add just a teeny bit of crunchiness to the smoothie, which I like. That also goes good with a teaspoon of dark cocoa powder. I also like to put in half a *ripe* plantain, just because it's has a slightly more lemony taste than a banana.

Try this for a filling, nutritious and delicious smoothie:

Ingredients:
2 pieces almonds
2 pieces cashews
2 pieces pecans
2 pieces walnuts
1 tsp pumpkin seeds (available in Mexican grocery stores as Pepitos)
1 tsp flax seeds
1 tsp cocoa nibs
2 tsp cranberries
2 tsp raisins (black)
1 apple - cored ad cut into 1" pieces
2 cups 4% milk
Optional:
3 strawberries
10 blueberries
2 blackberries

Grind the first 9 ingredients in a heavyduty blender. Once they become powdery, add the apple pieces, milk and optional fruits. Blend it till the fruits are ground.

No sugar needed for this recipe. All natural ingredients. Gives you energy and keeps you from snacking for at least three hours.

People who can eat bananas can add one banana to this smoothie when grinding.

Heavyduty Mixergrinders work well for this recipe as they grind the ingredients more uniformly.