It’s not an Apple sanctioned upgrade program, but a tutorial called ”
Color My World
” on the Focus on Mac Support of the About Web site.
The customization is accomplished using a wrappable texture. However, the procedure may not be for the faint of heart, as it does involve taking your Cube apart, screwdrivers, Exacto knives, Magic Markers, patience, and bravery. So proceed with caution. Needless to say, the procedure can void your warranty.