RIMSKIN is a San Diego based company that makes such a simple but amazing product.
They produce vinyl stickers for bicycle rims. Rimskin can accommodate almost every bicycle wheel size imaginable from BMX to 700 deep v rims and come in almost any color you would want. Every basic color but also some super awesome specialty options. They got glow in the dark, reflective, metallic, peacock print, snake skin print, and even CHALK BOARD.
Check them out here : www.therimskin.com