Oooh, I have found such great new ideas (of course on pinterest). Last year I did a basic PVC pipe frame for my backdrop. I used white shower curtains to cover the back. Then I crocheted words and pinned those one. The only parts that really showed the pvc were the sides. I found out I can sand and stain the pipe, and the pictures looked good.
Today i found instructions to bend pvc pipe! And without special tools. It involves heated sand instead of something like a heat gun. I may need a way to hold the shape, like a board with some long nails. I don't have a vision yet but I am starting to think.
My biggest idea has been to create a series of trees, crochet only and stand alone. I am working on one right now.