this might give ya some ideas...
the white is basically just a bone colour:
scorched brown, bestial brown, bleached bone, skull white(mix the ratios as ya like)...
the green is:
catachan green, camo green, bleached bone/camo green highlights(again, play around with the mix)...
these are all layers, with no washes...
p3 flesh wash is a nice purpley shade for the green if ya like to add different tones...
i'm playin' with a new version of the scheme now that is almost all p3...
the whites start with greatcoat grey and coal black, and go up through some menoth white and thrall flesh to pure white highlights...
it's not done yet, as i have to keep on the commissions before i play with experimental schemes:(...
work sucks...hahahahahaha...
cheers
jah