This is a design timelapse of a piece I took to calling "Goodnight!".
The design started with blocking out the scenery and character, then moved on to sculpting the character, and ended with composition and a complete switch from the Blender Internal Renderer, to Cycles Renderer.
Youtube Timelapse: http://youtu.be/kQFMfl4gUtU
Edit: If you zoom in, you can see some intricate details on the face of the ghost.