Free Utility: Today Wallpaper Viewer/Switcher
Mental Motions provides a free package, which includes 100 wallpaper (.tsk files) and more importantly a stylish utility to quickly view and select them (and yours) on your WM device (incl. WM5 support)
How to use Today Wallpaper Pack. 
First of all, you need to install Today Wallpaper Pack into PocketPC. The installation process is easy – just follow onscreen instructions. After installation, open Programs group in you Pocket PC and tap Today Wallpaper Pack icon. The program will load and you’ll see five buttons:
- Delete: tap this button if you want to current image from Pocket PC memory. Note that you can always reinstall Today Wallpaper Pack and get the deleted images back!
- Reset: tap this button if you don’t want to use Today Wallpaper Pack or want to uninstall current image from Today Screen. This will get Today Screen to usual theme image.
- Left: go to previous image
- Set wallpaper: tap to set current image as wallpaper
- Right: go to next image
- Exit: tap to exit application
Important update!
To remove wallpaper from Today Screen, use reset button. Don’t forget to tap this button before uninstallation of Today Wallpaper pack! – You can install this utility on your storage card and store your own .tsk files to the program folder to have this utility manage them as well
Download HERE!
Erm…there isn’t a single TSK file found in it. And the product page mentioned nothing about themes. It’s actually just an image viewer and a ton of GIF files. So, it isn’t a theme viewer.