The last truescale nurgle marine I painted (see pic) used rotting flesh basecoat over an undercoat that was black, sprayed with white from the top to create shading from the start, which was then washed with thinned down gretchin green and then thinned down thraka green - I liked the effect as is was closer to the death guard pre-heresy colours than the darker greens I've seen.
I am after some advice on nurgle schemes as well - but I want to use any base colour other than green (pale or otherwise) - I'm currently toying with grey and orange or a pox angels scheme (dirty blood red).
Hope this helps
Cheers Laney