No. There are no other skins than Basic. Trust me. The graphics for Marbella are long gone, and the rest were specific skins for Monster, Audi, Nuforce, etc. that were proprietary to Pluto, and we do not have them. I will remove them from our master database before our 0810 release.
The process you describe is what you need to do to create a new skin, but you will need to create a new database entry in the Skin table. You'll also want to add entries to the Style and StyleVariation tables as needed to adjust styles (using the new PK_Skin # that you get, as the FK_Skin value in the other tables.)