1. sew them altogether (kind of quilt style) and use it when you go on picnics, camping, barbecuing, etc...
2. make a large beach bag for when you go to the beach or the pool, that way you can use it if you need an extra towel.
3. if there are any decorative ones (like from a hotel or monogrammed) and staple them to the back of an old frame and hang it as art...and if you have a few that are similar you can do a collection!
4. make an apron for when you're doing the dishes or cleaning (or crafting!).
5. make car seat slip covers so that when you're on the way back from the beach you wont get sand all over the seats of your car.