Although PVC pipes may not seem like they are a good background material, they can definitely be used. I always thought it would be cool to make a background out of all different sizes and lengths of PVC pipes put together like:
Once heated, PVC pipes can be bent to any direction you would like. PVC pipes can be great to make into a tree with roots or an awesome behind the background cave system.
Here are some photos of thaves427’s tree background made from PVC as seen on Photobucket.
Here is a short video on how to make your own behind your background cave system. I don’t think I would be able to use this in a tank because I would be worried about not seeing the froggies in a couple days, but with a little modification it could be a pretty cool background or make a good place for plants roots and micro fauna to thrive. The video shows it used in an aquarium, but the same concept could be applied to a terrarium as well! Skip to 1:00 minute for directions.
Have you seen any cool tank backgrounds made out of PVC?