From Windows Ultimate
"Windows DreamScene is currently available only as a preview version, but many of you have chosen to install it. In recognition of your interest, we accelerated our schedule to release a Content Pack that contains four video backgrounds, which are now available on Windows Update.
The four videos are:
- A field of thistle, with a bee gathering pollen
- The rushing water of a forest stream
- A streetlamp reflected in a puddle, with softly falling rain
- Orange wisps flowing in a computer-generated scene
Learn more here