I agree. I think you (Mars, not Bunsen) should keep it two-tone. It shows that it's unique, that work was done on it.
I think those are both great ideas as well. The keyboard should be opposite-color from the surround; possibly with alpha keys and numerics/extras different. (Or maybe just the F-keys.)
If you're going to have it single-tone, I'd say see if you can actually make it gray. (But that's a lot more work, of course.)
