The BIOME was dreamt up by designers' at Mercedes' Californian design studio as the "perfect vehicle of the future" and is one of the wackiest cars on this list. It is meant to be "at one with nature" and is actually a kind of, er, living organism. Apparently the wheels would be sown with seeds, and the bodywork would be grown from the DNA of what Mercedes call BioFibre, which would absorb the sun's rays and store it as energy in a chemical bond called BioNectar4534 (no, we don't understand it either). The car would only emit oxygen, which is obviously a good thing for us humans, but has BioFibre actually been invented yet? Er, no. That doesn't stop this being one remarkable idea. And the boss of Mercedes' California design studio Hubert Lee says: "There are elements within the design that could easily be progressed and developed for production." Bring on the future!