Well, I have a wide range of colors in my units, for example i have a khornate warriorregiment that is mostly red, and a undivided one that is almost completely brass / brown to the coloring.
I was thinking that this muted greyish green seemed natural to a reptillian dragon/lizard coloring
Was thinking to aply the green on every part of the skin/scales/whatnot except for the wing membranes, on that matter I'm still open for suggestions!