Adam Kinney has created a nice Avatar Mosaic Prototype with the help of the Artefact Animator library.
After finding out about the Artefact Animator, written by Jesse Graupmann, I knew I wanted to try it out.
The Artefact Animator library is based on the same concept as Tweener for Flash, which provides an easy way to do procedural animations in WPF and Silverlight.
I found some time last night to put together this little Xbox Live avatar mosaic and was very pleased with the results.