I have quite a number of things to with bands. From framing them to laminating them for placemats/coasters. I even did deco podge for an ashtray that I bombed Chenvt. All sorts of crafty things to do with them. If you don't forsee yourself doing anything crafty with them, then others suggestions of putting in a book or somewhere to glance at them is nice for memories. Or... just throw them out. It's not like you won't have more.
Here's the ashtray I made:
