Logon XP makes the task of swaping logonui screens easy. Simply select a new logonui file and you're set! You can even preview your logon screens before selecting the one you want.

New in Logon XP 2.0.0:
1.) A new name. XP LogonUI is now known as Logon XP.
2.) Random logon screen selection. You can now define a list of logon screens to randomly pick from at logon.
3.) Logon XP can be minimized to the tray and loaded at startup.