100 things for 100th day of school

I'm supposed to help my daughter bring 100 of something to school. Ugh! This is not what I want to do. What can I do that isn't going to be a waste of materials or food? Or do I let my daughter decide and she handles it even if it's not "right "?

update: thanks for everyone's input! we decided to do paperclips so the teacher can keep them after. we don't have pennies at home (have to go to the bank) we don't eat cereal so we can't do that either