Mercedes-Benz Biome
The best part is that Mercedes-Benz says the Biome can be grown from seeds, and not built in a traditional factory. It sounds crazy, but that's part of the fun with any dream car. Using genetically modified trees and powered by something called BioNectar4534, Mercedes-Benz says the Biome's bio-fiber cloth body would be grown organically, and on the road, the car would emit pure oxygen. The Biome reportedly would weigh only 875 lbs.
It will be several generations before anyone starts pondering the spec sheet for a genetically-built Mercedes like the Biome.