Hmm.. ever played Supreme Commander? Cybran nation there likes to use black and red.
Black end white? ..hmm sounds like Kadeshi colors from Homeworld game. Which is cool.. I'm not sure but you might wanna check out your bricks again and if necessary buy some new sets.. that might improve the color scheme.
But IMO.. those black turrets are cool despite their color.
Anyways.. keep on brickin'!