I think camo can look good in things like Blackmachines and some of these Ibanez guitars. But it wouldn't suit anything "traditionally styled", and I'm afraid I'd have to say the same about burnt chrome too.
I like the look of the covers themselves, they're great, but I wouldn't put them in any of my guitars.
I know it's boring, but I like the covers to match the rest of the hardware, so it's nickel, chrome or (theoretically) gold all the way for me.