5. Honda PUYO
Year Made: 2007
Estimated Cost: Undisclosed
Honda unveiled the PUYO, which it described as a “seamless soft box,” at the Tokyo Motor Show in 2008. This fuel-cell concept vehicle glowed in the dark, and, even when it was daylight, it was still an unmistakable neon green. The propulsion came from a fuel cell that kept with the Honda theme of “endless joy…on our earth.”

Honda PUYO @UltimativCars / Twitter.com
The PUYO, which got its name from a Japanese onomatopoeia, was part of a series of Honda tech designed to reduce CO2 emissions and “address environmental issues.” The unique-looking vehicle did not get a production version, but there’s no denying that the eco-friendly tech behind it had an impact in later, more conventional Hondas.
