We love the warm flicker of just one or two candles on the table during our evening meals. But you don't have to break out the formal candelabra, or keep a lot of extra candleholders around: just use one of your ordinary tumblers to hold a tealight.
For my wedding last summer I bought several dozen classic Duralex tumblers to hold beeswax candles on the dinner tables. They're all-purpose tumblers: they're great for juice, water, and wine. I still use a few to light up the dinner table, too. They're simple and casual, and when I'm done with the candle I put the glass back into use.
Other good multi-purpose glasses that will double as candleholders or even vases include Mason jars, glass yogurt pots, jam jars, and small glass bowls. The recycled glass tumblers pictured above are also very nice, but they're rather overpriced (we think). Try Pier 1 or Target for a similar look at a lower price.