BMW unveiled a wild new concept at this year's big tech trade show: A color-changing car. Drivers can change the color of the car at the touch of a button, instantly, the automaker said.

Drivers can customize the car even further thanks to BMW's latest version of its E Ink technology. Built-in e-ink panels can display and mix-and-match up to 32 colors across the car's body and wheels.

Any BMW M3 is a special car, even if you go for the most basic model without options – any spirited driver would love to own one, regardless of doors, color and specs. However, M3Post member ...