Took Duncan's guide on Warhammer TV for painting Clanrats, and applied it directly to the Verminlord Warbringer - and I think I came up with something that looks decent enough and yet took very little time to paint (perhaps the equivalent of ten-odd Clanrats?).
The only real changes I made were a lighter shade for the grey loincloth (base Skavenblight Dinge), and adding the Warpstone elements in his weapon.
Still haven't figured out bases though, but it seems to matter less on this model