I totally forgot about this, I meant to post it last month but I forgot.
Basically, you can reskin Mario Kart Wii.
What You Will Need!
Gamma Back Up Launcher
A Backup Dump File Of Mario Kart Wii
DVD+R (Or DVD-R Whatever You Choose)
GBAtemp has a video showing how to setup the textures and links to some apps you’ll need. They also have a bunch of texture “hack” videos.