I've been pulled over before for a car's appearance or sound, but not due to color. One was a Panoz Roadster, he pulled me over because it didn't look or sound street legal (even though I had a rear license plate with current sticker) and he wanted to see the registration. When I showed him the reg and he realized it was legal, he walked around the car slowly, checking it out, saying, "How the hell do you drive the speed limit in that thing?" with a big smile on his face. He could have ticketed me for not having a front license plate, but he didn't.