Teen bedroom mural ideas?

I'm going to be re-doing my room soon, and I really want to paint some kind of cool mural on my wall. A girl at my school spray painted a black chesire cat on her wall, and I thought that was pretty cool so I would love to do something like that...especially since i love art :) I need some ideas for a cartoon character/design. I like a lot of cartoons, but I can't really think of anything :/ thanks