I'll take black and silver please ;-)
I also tend to prefer the monochrome look, although I've recently been recolouring all my FO4 outfits pink-and-white thanks to the questionable influence of a friend. The vault suit actually looks quite fetching in bright pink with white stilettos. Obviously when I say "quite fetching" I mean "absolutely ludicrous", but y'know.
I did spot some dyes for sale occasionally but was always too broke to try them out. They were a constant irritation in D:OS though, there were never enough that were the same colour but I often ended up with rather bizarre and vulgar-looking outfits if I didn't make some effort to dye them.