Free plans. Make a greenhouse, Pastured Poultry Pen (Chicken coop house), Cold Frame, Quad, ATV, Golfcart Carport mini garage shed, Banner Holder, row covers and more structural buildings out of PVC pipe. pvc plans has all the free plans for you. There are loads of projects and plans submitted to them as well, like this animal pen by by Shelley L Oney.
Free PVC plans to make loads of things.