If you fancy decking out your Pocket PC for Christmas, then get hold of the Greetings 24 Theme.
This free Windows Mobile theme will give your device a frosty winter theme. It features a striking sky blue background adorned with pretty snowflakes. The wallpaper appears behind the Today screen and the menu screens in Windows Mobile 6.5 and there are no significant readability issues.
If you want a tasteful seasonal theme for your Pocket PC, Greetings 24 Theme is a great choice.