PVC tool holder/caddy (this one's used in my stained glass studio). Made from 2.5" lengths of 1" PVC pipe attached to MDF with screws. Each piece of PVC was angle cut at one end so the screw was easily accessed.
Backyard canopy. Put PVC pipe into a 5-gallon bucket, then pour cement around it. Once dry, put bucket into tall planter, surround bucket w/ gravel, then top w/ soil. (Not covering pipe) Stick bamboo pole into the pipe & hang fabric w/ ties through grommets.