I would put Hot Wheels stickers on personally.. but each to their own :)
why not both?
Paisley pattern would be cool.
Hey, with all these neat suggestions, you can change it up now and then!<br />
Animal prints.. zebra, leopard<br />
Flames like the ones on fast cars<br />
Glitter stickers<br />
I love your imagination!
Whatever floats your boat.