Another fantastic idea and saved a lot of money and gave my house cats a lot of pleasure was to use it to build a cat house complete with a scratching post. The frame instead of being built with all wood was built with PVC as high as I wanted it. With a little carpeting and a small piece of plywood it was finished within a couple of hours.
I left one place open and dangled some toys from it that they bat around. Even the 22 year old cat of mine was interested in it and for him, I connected a small ramp to the top built with smaller PVC.
Some quick things that PVC can be used for: shelving, rods, collecting small things in the workshop, running cords through, running an ice maker line through and of course, plumbing!