What should I paint on my fingernails?

I'm pretty popular around church and school for my fingernails, they always have something crazy on them, and I try and change them every couple weeks, but school's starting soon and I want something cool to paint on them, but I'm out of ideas. Once for fall I painted a tree with falling leaves on my thumbs, and I've done pac-man chasing the dots with one of those inky things chasing him, and I've done an alto sax, and ballet shoes, and music notes, and fish, a tuxedo on my thumb, paint splatters, and a lot of other things. I need a cool idea. Nothing cliche like flowers or erflies. Any ideas would be helpful. :)