We like the shape and size of these; Pottery Barn says the design was based on the distinctive curve of vintage hurricane lamps. Even though we usually prefer glass for this sort of thing, acrylic is lighter than glass, so they're easier to carry to the beach or park, and they're also good for those no-glass-allowed public spots.
They also come in several subtle colors: green, turquoise, and orange. We do find the price a little hefty - $59 apiece. But watch as the season moves along; these will probably go on sale by the middle of the summer.