Hey, Cobaltdream :)
I was looking at an image from one of the people in our new critique forum, and the way the background was made, made me think of you and this thread, so I thought I'd share this:
this image: http://www.renderosity.com/mod/gallery/index.php?image_id=1489379

Look at the description of how the background was made, Art Pearl just took a plane, and draped it over a cylinder with the help of cloth sim. This gave him a nice flowing background. With some low light, that could make a very nice muted, but still dynamic backing for a dance scene. Especially if the background flow happens to support the scene composition and movement.

I dunno that the linked image background would work for what you have in mind, but the concept of it might!

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