What does your desktop look like? Does a screenshot tell the whole story? You can create videos of your desktop with free programs like Camstudio and then use Microsoft Movie Maker or some other program to turn it into a nice small .WMV file.

To get the ball rolling, here's my desktop from this month:

Windows Media Player: https://www.stardock.com/video/frogboy-aug03.wmv

Quicktime: https://www.stardock.com/video/Frogboy-aug03.mov

The WMP one is about 4.5 megs, the Quicktime is about 8 megs.