The classic "nerd" glasses seem to be popular among everybody these days and they are my favorite trend of the moment! And the best thing about them is that you do not need a prescription to wear them! Urban Outfitters has a good selection of oversized glasses (if your online look under accessories then sunglasses) and last time I was at Forever 21 they were stocking their shelves with all different colors and sized frames!
Hilary Duff in her "nerd" glasses
Lauren Conrad out and about in her pair!