Check out Alsa Corporation's new exotic finish - Eclipse - Heat Sensitive Color Changing Paint. I'm not a paint expert, so I really don't understand how this works exactly, but when you apply hot or cold temperatures to the paint, it is able to change color instantly. The best example I could find of it in action is in the color changing sink video below. I don't know if I really need a green slime color changing sink, but I would love to paint my car with this stuff, rob banks and hit the closest car wash to change the car's color and make my getaway before it changes back.
Eclipse - Heat Sensitive Color Changing Paint