Calling creative mamas

My daughter (Kindergarten) has a project to do and I need help. She had to do something for the 100th day of school it could be anything. Bring in 100 pennies, pieces of cereal or whatever and then find a way to display it. We want to get creative and do something different and maybe display it on a poster board. I want to go all out to help her but I'm not creative any ideas?? We are open to anything....