Wind or tire powered car
A car that is windpowered. A small wind turbin on the top or even underneath the car, maybe even in the front behind the grill. Cars are always producing wind. Maybe even a car that could be regenerated just by the spin of the tires. Of course their should be a battery that can be charged at home, or even by solar. this is such a great idea, and could easily be added on to cars.
Reward: getting the reward for free, or just let everyone know i was the first to have the idea