As posted by Al, with the rear diffuser look where the top and main section of the bumper is colour coded leaving the lower black bit, works really well imo. In fact in most colours I think I prefer it to the Ed30 bumper purely cause of the shape - just my preference
As for the skirts, I think they look out of place black, a bit like a stuck on kit. I purchased an Ed30 splitter anyway but colour coding the standard GTI one is neat.
I'd do it Luke. Photoshop it and see what you think