Metroid Prime 3 lets you decorate Samus's ship with several Wii game bumper stickers, each unlocked by having the corresponding game save file on your Wii. The Mario-related decals are the following: Mario Party 8, Super Mario Galaxy, Super Paper Mario, Super Smash Bros. Brawl, and WarioWare: Smooth Moves. You can activate the bumper sticker bonus under Extras.