Gina picked these tubes up from a local bike shop that had stopped carrying Cannondale. The tubing was used to show the different colors for some model year. My understanding is all they were good for was falling over and making a racket. Now they can just hang around and look nice.
The wheel came off an old rusted to death Huffy, and the whole thing turns around the axle. Other materials include some old chains, 1/8" and 3/16" rolled steel and a piece of 3/16" plate. Now I'm trying to find appropriate old junk parts to make wind cups with so it will spin with the wind. Maybe a couple of old saddles would work.