The color has no bearing on the quality or the performance of your parts. Some people prefer their PCs to also be fashion statements; that's fine, but does not make them any faster, or "better" in any way. By all means avoid a color you think is ugly, but it really doesn't matter. If you like your particular colors, then you may well enjoy having a windowed case, especially if you have also added LED lighting of some kind to your case.
This is not to disparage a neat, well-thought-out build, although IMHO, neat cable management is more impressive (and useful, as airflow is better) than particular color choices.