I was looking for motion tracking tutorials and somehow stumbled across this amazing piece of work. It is not exactly 3d related, in fact the video images are 100% real, but honestly when I first began to watch I thought the video had been composited with artificial skies!
The film uses a motion control rig (they used a product from camBLOCK) to capture these stunning time lapse images. Basically, the camera is set to record an image say, every 20 seconds while at the same time it is attached to a motor that moves the camera ever so slightly over time. For example, a shot might dolly a few feet over a 6 hour span! Amazing! The resulting video creates an almost surreal view of the sky.
To view images from the production, check out the TimeScapes blog.