Here's the biggest of the Big Meks: My converted Ghazghkull Thraka, with a lick of paint.
Undercoated in Citadel Black, then Tamiya Dull Red. Plenty of Boltgun Metal and various colours for detail. Sprayed with Tamiya Clear, which I must have done a bit too heavily because it came out glossy. Sprayed again with a very light coat of Citadel Purity Seal (clear matt varnish) which took the shine off a bit. The base is a GW resin piece, done in shades of Codex Grey, blended through to Space Wolf Grey.