When I did Iron warriors a while back I based coated them in GW black spray primer. Then did the undercoat in a 50-50 mix of Boltgun Metal with Chaos Black. To "shine" it up a bit I went and dry brushed boltgun over that, very lightly, to pick out the details.
Next I did shining gold for accent colors, like around the shoulder pads, etc. Cover these accents, thinly, with an ogryn flesh wash, this adds an uncared for feel to the gold. Can even add some rust affects to the edges of the armor to make em look worn out. You can do this by making a brown wash from scorched earth (i think) or use powders if you want, and applying thin streaks near the edges, where water would pool.
Sadly, I got rid of this army a long time ago, so no pics, but it looked real good.
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