Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
here is a pic of an example.
The directory name is the same as the Description record in the "Skins" table. OrbiterGen will use the new graphics if they exist, and will revert to the graphics in "Basic" if they don't. You don't need to completely replace every graphic, just the ones you want.