They can be used for making bracelets and key chains by somehow hooking them together. I have seen them but don't know how they attach them. Also some schools and charities collect them for the aluminum content. I know of one school that collected a million of them to show kids what a million of something looks like.
I have seen people make key chains and bracelets from them. Somehow they link 3 or 4 in a stack and then link them together. Also, some schools and charities collect them. One school collects them to show the classes what a million of something looks like.