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I'd say bling or weathering are the way to go. The issue is that your scheme, being primarily metallic, doesn't really allow for much (i.e. blacklining) in the way of shading, so you're left with large fields of unvaried color. A touch of mud or smattering of icons, seals, and text (depending on the feeling you want to convey) would help to break up those fields without compromising the scheme.
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