I'd think color, at least the color of components, can bias one towards perceiving a certain sound. It probably isn't total coincidence that Conrad Johnon tube amps, for instance, are gold colored and are often described as having a "golden" sound.
I've noticed that look of a speaker can have some influence on how I perceive the sound. I really love a good, deep wood veneer and that always puts me in a good state of mind for listening when I see a speaker with a great wood finish.
As for room color, I deliberately did my room to work with stereo/AV gear, speaker especially. Speakers tend to come in a combination of brown (wood veneer - at least the ones I'm attracted to) and back (usually speaker grill, or the drivers, etc).
So I did my room in a combination of brown and black tones, with some warm cream thrown in. It worked perfectly. Almost every speaker I put in there seems like it was "made for the room" because it blends so well with the decor. (Unless a speaker has a really different color...and then usually it doesn't stay too long).