Glass "pine" wood derby car
At a trade show i recently attended we had a glass pinewood derby race with the cars being sold to charity at the end. The rules were it had to be made of glass and a functional pipe also weight limit was 1lbs 2oz. i got my car built last second i went with an alien in a spaceship theme to match my glass. 
The 
Oh man. What an awesome idea!
Once i work out how to upload videos ill have a few of the races up it was so fun