I have been thinking of getting mine resprayed in a classic honda tri-color theme. The CB400 comes in a few different tri-color combos and has similar lines to the CB919. The bike in the first post would look sweet with gold wheels and calipers.
In the original post I think the side cover in blue would work better. Oddly enough in the others Honda appear to disagree with me!
Perhaps white? Or even red to change up the colors? I agree the black doesn't flow as well as it should. Painted the gray side cover on the yellow hornet yellow (yay, palindromes!) and it looked so much better, really made the bike complete.