One of my uncles is very much against the black color. He would never a black turban. He says its bad luck for him. I know Giani Maskeen Ji use to wear a black turban at most times.
Ayways, I agree. Color doesn't mean much in of itself, but it can help represent your mood. I know traditionally, white turban is considered saintly or pure. I am big fan of the dark blue color myself.
WJJK
WJJF