What do you do with yours?
We save ours at school and use them for giving each child in the class a little pva glue. They can be thrown away afterwards...no washing up! I have also started collecting the green, and blue ones. With a permanent marker you can write consonants on the green ones and vowels on the blue ones. Children can make words with them.
Use them for wheels on junk models also for filling larger containers to make shakers (Tezz)
Our school collects them and gives them to the local children's hospice who exchange them for money. I think alot of schools round here do the same so it adds up to a fair bit of money. (Juniper)
If you have any other ideas then join the forum and post your idea or comment on this thread.