You know when your a craftster when alternative uses for bottlecaps keeps you up at night! I glued pictures to mine and glued them to buttons (search 'anime bottlecap buttons' if you want to see them, i have yet to figure out how to add a link to another topic
I thought of:
turning them the wrong way up and using them as tiny photo frames
a baking tray in a dolls house
childrens play money (file down the sharp bits and draw 10p and 20p on them)
Windchimes! This person I lived next door to made a windchime out of spoons which was very cool.