Michael S. Scherotter created a stunning Silverlight application using Expression Studio.  See the full frame version at http://xmldocs.net/ball/.  I particularly like the night mode.  For details on the creative process and mechanics, see his blog post at http://blogs.msdn.com/synergist/archive/2008/05/24/beauty-with-silverlight.aspx.  Here's the iFrame version of the application.