Okay, the logon screen was accepted by WinCustomize (thanks for the copyright info Dionysus).

To get the screen, go here http://www.wincustomize.com/skins.asp?library=26 (if it isn't readily visible, search for Medieval)

Logons is a free download from WinCustomize. It changes the way the XP logon screen looks.

The MTW scrren also includes 9 user images.

Now you can make it Medieval