It may be possible in the Wii version, but it would require a lot of time to take apart the file and change a texture (it's also probably illegal).
There are reskins done for the Nintendo 64 version (played on a PC using an Emulator) but they aren't as simple as a few cheat codes.
Chat with our AI personalities
As of now, only Super Mario Galaxy. But in 2010 we will get Super Mario Galaxy 2 and New Super Mario Bros. Wii.
There is NOT SUPER MARIO WORLD Wii...
They call it Super Mario Bros Wii for a reason
No she is not, but she is in Super Mario Galaxy and Mario Kart Wii.
In Mario Super Sluggers Wii? No.