Need Help with video Backgrounds.

I am looking for some video background ideas for a project i am working on. Here is a web site that sells Video background animations to give you an idea of what I am talking about.
http://www.animationsforvideo.com/
Many inteterestind background animations can be generated with Blender. Anyone have some interesting ways to do this.

I have been working on running animations where I have a marble texture on the world settings using the coordinates of an object. By animating the object’s size and rotating I am getting some interesting effects.

I used two rings as particle emitters to create a background for a video. Possibilities are limited only by the imagination.