Well, actually they're not completely new, just reworked from some I did for GC II, but never released.
Preview pic:
Download (updated May 2016):
https://www.sendspace.com/file/5bjeyr
Oh, little note: names are racelogo56.png up to no.xxx People who do use those logos having those names already may need to rename some of the newer gfx to avoid conflicts.