A fun racers car has been created by Michael Overstreet with his friends. These cars are taking the shape of the Bowser shell and koopa shell from Super Mario Bros world.
Michael and his friends used Makerbot 3D printer to create the shell, and attached to a small racer car that could be controlled with various kind of smartphones. It looks like a fun gadget and those who have 3D printers might be able to do something similar.
You can find more details at the following video or their website if you are interested to know more.