Unfulfilled Commercial Products.
Junkyard of imagination=Magic.
They could be projects that I've failed at, or they could be blueprints for projects that I can just never achieve. They can be plans and blueprints for projects that are simply too expensive or foolish to ever be worthwhile, but are fun to think about.
Example: the solid gold Goofy (from Disney) statue that is the size of the Burj Khalifa, launched into outer space to orbit the earth.
Note: this idea preceded Elon Musk launching a Tesla driven by a mannequin into space by about three years... so it was more original at the time.
Still, it could simply be any plan of that nature that is simply too ambitious. However, it should be spelled out and documented as though I'm seriously going to work on it.
Also, a related idea is a Gallery that only displays blueprints, sketches, post it notes and other preliminary materials, for failed or impossible projects.