I agree with KB--the ones she mentioned are great colors that serve as neutrals; I added a few more--I put the brighter skin first and the more muted/darker second or third. This is based on what I've seen, not necessarily the full gamut of leathers available for each color. Those who have seen more or dispute the list feel free to correct!
Rouge H-Clemence, Chevre, Vache Liagee
Chartreuse-Clemence, Chevre (hard one--they look the same, although perhaps Chevre is brighter?? not sure)
Vert Anis -Togo, Chevre
Potiron -Clemence, Epsom (paler)
Raisin-Clemence, Chevre
Brique- Box, Vache Liagee
Brighton Blue--Clemence, Chevre (see Shoes' beautful Bolide)
Blue Jean-Clemence, Togo, Epsom (very pale--almost ice blue)