While not exactly new technology, it is still rare enough to drop jaws to the floor. Thermochromic paint and wraps are like the mood ring you had in elementary school. Changes in temperature change the color of the car. This can be used to stunning effect, hiding works of art other otherwise tame looking vehicles. While the best way to demonstrate the change is by splashing hot or cold water onto the car, depending on the temperature threshold, the color could conceivably change colors from the engine warming up or even just driving out of a cool garage into the hot sun.
We love that your car can be tame and blend in while parked in a shady parking lot and then be vibrant and flashy going down the street on a warm day. Perfect for those who can't pick a color.