Funny you should mention that, I just finished painting a very green insidious madness for the crew. (Which I then played terribly against Lord shaper:sad2:)
I've always been a fan of strong colors in my fantasy palette, if I want to paint muted and drab then I generally paint an actual model, like the excellent WW1 models by Peter Jackson's company (Yes he of LOTR) Wingnut wings. That gives me my dose of reality!
Anyway, I digress, I have never really painted purples, I might give it a go with Coppelius. It would break the crew up a bit.