Pulled a screenshot from one of the old episodes ("Zorak" if you are curious) and grabbed the logo. Extruded it and made a back plate. I've included a combo mesh as well as a back and top so you can go multi-color if you want.

If Space Ghost actually saw this and was given a choice of which was his favorite, I'm sure he would say "COOOOOOOOOOOOOOOOOMBOOOOOOOOOOOOOOOO!" and then blask Zorak.