I am a fan of “StumbleUpon” and I ran across this art installation by Viennese/Croatian design collective For Use/Numen. Here’s the web address: http://www.fastcompany.com/1656197/designers-create-spiderman-worthy-cave-from-packing-tape
This design is entirely made from packing tape. It is so strong people can crawl inside it! I think a scaled down version would make an INCREDIBLE theatrical backdrop with the right lighting!
Another idea for a VERY inexpensive backdrop “Scrim” is to staple together soda six-pack plastic holders into a large curtain. Light it blue and voila! … instant abstract ocean. Light it green… forest! Red lights? … fires of Hell, you get the idea.