I have always looked for ways to add interactivity and movement to pages without losing browser functionality and accessibilty. I have been experimenting recently with using Flash as backgrounds to normal, semantic XHTML pages. This idea isn't new, i havent personally seen it implemented but i have seen topics discussing its usage.

My idea was to use the Flash as a moving background, something subtle that would'nt cause the user problems while accessing the content of a page but instead enhance the design and user experience.