Microsoft Announces PocketPC 2002
http://www.microsoft.com/mobile/pocketpc/pocketpc2002/default.asp


Now what's important for WinCustomize here ?
The skinning part in WindowsMediaPlayer:
"WMP8 is skinnable, and has a skin changer built in, no longer is it the realm of the power toys. Any WMP skin that has been created for Pocket PC should work with this new version." - Smaller.com

You can take the guided tour here:
http://www.microsoft.com/mobile/pocketpc/pocketpc2002/interface.asp

Or Jump into the skin/GUI parts in these two pages:

Interface: Personalize Your Today Screen
http://www.microsoft.com/mobile/pocketpc/pocketpc2002/interface.asp

Windows Media Player: Personalize Your Media Player Screen
(Be creative! Personalize the look and feel of your player with new "skins" (interface designs) and an integrated skin-chooser tool. )
http://www.microsoft.com/mobile/pocketpc/pocketpc2002/mediaplayer.asp
In this page, you can see the WMP, and then click the "Personalize Your Media Player Screen" link at the right of the picture to see the personalization in action.

A lot of pictures from PocketPCThoughts.com here :
http://www.pocketpcthoughts.com/articles/merlinrevealed.html

Also more information from Smaller.com here:
http://www.smaller.com/article.cfm?id=2733&
But the "meat", the WMP part is here,
http://www.smaller.com/article.cfm?id=2733&page=8&
and I quote a "funny" sentence from that page :
"Three default skins come with the OS, but none of these will compare to what you can download from sites like skins.org."

And more information with an exampleof the customization of the "main screen" made by them here:
http://www.pocketpcpassion.com/General/PocketPC2002/PC2002_1.htm