I went with Dark Angels Green as my main color. Otherwise I used alot of the colors from the Cryx paint set. I also like alot more "metal" showing than how the studio armies are painted. This allows me to paint alot of rust and corrosion.
Here is a picture of my Scaverous
Not a great picture, but you should be able to get a good idea of how my color scheme worked.
I also have seen Cryx in a dark red, almost purple. And I think one common alternate color scheme from MK I was black with gold trim.