Oh, Vlad has a mac, you can't make it fade like that on XP as far as I know, I know theres software out there to make it change every however minutes/hours/days though. The only one I know of is StyleXP but that only lets you change every day, logon, or week I think, I'll look for something better though tommoow, getting pretty late.
I was wondering Vlad, how did you do that screenshot like that, animated?