This is from Microsoft. It is a Theme Generator but it also installs a program on the PocketPC that sets up theme rotation and changes. It can be configured to change every few minutes you can pick the themes you want to rotate. It can be set to days hours or minutes. I have been using it and it works pretty good. Nothing fancy but does the job. Here is the link
Pocket PC Theme Generator Power Toy 2.0
http://www.microsoft.com/downloads/d...displaylang=en