I'm going to resurrect this thread (and include a link):
http://www.microsoft.com/mobile/pock.../powertoys.asp
as this is a set of very useful apps, especially for folks using XP. Plus, they're all free!
You get a Theme Generator for the PC which lets you easily make themes for your Axim.
It installs extensions to windows, so that you can view the .tsk files using explorer, just as easily as if they were .jpgs or .bmps.
It provides you with the Theme Switcher program itself for the axim, which will enable you to load up a variety of available, or custom-made themes, and rotate through them automagically, so that you never tire of the same old thing. (You can also just tap the Theme Switcher on your screen, to jump to your next theme)
But remember, the PC-side programming is for XP. As it is freeware, the Theme Switcher alone has been posted on several other sites, for people running other operating systems, if you just want the axim-side software.
This is a great tool!