If you starch the heck out of them, you may get them to lie flat. Then I would make a 'mini' quilt wallhanging, mug rugs, coasters, pot holders or put them together for a small coin purse. In fact, there is a pattern out there to make a little snap purse using metal tape measures for the closures, really easy to make. I would definitely use the squares up with one of these small projects.
You could even hand sew them while waiting for a doctor's appointment or watching TV. I make little hexies while waiting for my appointments and it is amazing how many you can put together in that time.
These little projects would make wonderful gifts to have on hand for birthdays or Christmas or just for giving away or even for boutique's to make a little 'mad money.' Have fun.