I would avoid red if I were you, has connotations of Khorne, by all means go for it if you want, but I'd go with a rich green, it looks really good with gold without having associations with existing GW colour schemes. For the same reason I'd avoid blue with the gold, looks very 'thousand sons-y'. If you wanted to go with something really off the wall you could try bone-white with gore-splatters - lonewolf's method is really good.
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Tan? You're joking, I'm a gamer, you're lucky I'm wearing deodorant!
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