OpenCL accelerated SmallLuxGPU v1.5 rendered animation created with Blender 2.5 (physics using built-in Bullet Physics engine). Featuring HDRI lighting and camera depth of field.

Using open source software, links:
SmallLuxGPU (SLG): http://www.luxrender.net/wiki/index.php?title=SLG
Blender 2.5: http://www.blender.org/
Bullet Physics: http://www.bulletphysics.com/