Since we moved to the US, I've noticed by far the most predominant car colours are white, silver, grey, beige and black. Looking out of my window this morning, in the rows of several hundred cars in the parking lots around my office, I can see three red cars, one yellow, one blue and one green. The rest of them are all the usual suspects. It's like living in a 1950's movie and not in a good way either.
I haven't been able to determine yet whether this monotone colour choice is actually a choice people make, or something that the car companies thrust upon us over here under the assumption that people won't buy anything colourful.
You can see the problem for yourself if you go to any of the brand name's US websites. Take my current ride for example - a VW Tiguan. On the US site they have red, blue, silver, black, grey, and two shades of white. In Europe you can get all those colours, plus metallic cream, sky blue, yellow and orange (depending on the variant). Toyota vehicles - in the US we get beige, white, silver, grey, black and dark blue (almost black). One or two models have red available.
The light at the end of the tunnel here are the new Ford models (Fiesta, Focus) that come in an explosion of colours. Fiat are doing the same thing - wild colours - bright yellows, orange, green, several different reds. Time will tell if people buy them or if we'll end up in the same monochrome world. It's not looking hopeful though - when I spoke to the new Fiat dealer in town, they'd sold 12 Fiat 500s in the first couple of weeks. Two silver, two white, eight black, none of them with any coloured graphics. The four they had on special order were three grey and one red.
You can see examples of this monochrome world by looking in Google earth. Best place to look is airport long-term parking lots. Here's a starting point.
Amsterdam - explosion of colour: 52 17 28.29N 4 44 9.28E
Chicago - monochrome with the odd red car: 33 57 4.45N 118 23 38.95W