At the 42nd Tokyo Motor Show, Toyota showed off their Fun-Vii concept car. The car changes its outer color, because basically the entire upper is a display. While these kind of things were dreams for the future only a couple of years ago, they are today technically possible. Of course this is still in concept stage, but it gives a pretty good idea of what the car manufacturers are able to do in the next couple of decades.
Check out the presentation video here below.