You know you never notice something and then you do it and then you notice it all around you? It often happens right after you buy a car, and then suddenly it seems like your car, in your color is everywhere. Well, in this case its about stretchy spandex sculptures. While I did use spandex about 7 years ago in a production (though not quite as artsy, it really wasn't a common theatrical fabric. Then last year a production used a spandex like material to do some organic forms, and the next thing I know they are everywhere- you can even buy them preformed. I suppose that part of the new popularity is that you can project and light them in very interesting ways (and it doesn't make your whole audience cough).
Rosebrand sells fabric which distinctly lists stretch factor (in both directions if needed), as well as whole scenic elements. If you want to get a little more fancy check out Pink inc.
Though, while these are fun, I still think buying some fabric, a variety of fabric clips, and a few hours with some friends and a ladder may be the best way to go.