So this guy at IBM turns a Linux LiveCD into a Windows Screensaver…crazy thing is, you can actually USE the Linux OS
Construct and package a Linux® LiveCD so that it will install using the standard Microsoft® Windows® install process and will operate as a standard Windows screensaver.
This screensaver comes equipped with 700MB of applications to help school children learn their math and physics.
http://www-128.ibm.com/developerworks/linux/library/l-scrnsave/