I've been sitting on this demo a few weeks, so I'm excited to finally share the code publicly.
Go down the the WinFX Runtime Components - November CTP
The latest release includes a simple, static event: CompositionTarget.Rendering. This simple event will give you call every frame. What does this enable? Some sweet animated effects.
I basically took Dan's Tile Panel and updated it to use CompositionTarget.Rendering, private attached properties, and a little high school physics. The results are pretty cool.
Since it's just a Panel, you can put anything you want in it: Shapes, Controls, Images. Images look really cool.