Here's something to add some fun to your Game Cube: a skin! This is a skin (a series of stickers with graphics on them, that are precicely made to fit on your console, to decorate it) from "Gamer Grafix" As you can see, it's for Sonic Riders, and has pictures of nearly everyone from the game to go on all sides of your cube. 

This was found at a Planet X Store. One of these stores is located in San Diego, California.