Had a spare 20 mins so knocked up this.
Only works if you have Vista
Compile it as a .SCR, stick it in the windows\system32 folder - set it as your screen saver and you can look as sad as my PC after 10 mins as it goes through your windows in the 3D mode every second or so....
; AutoIt Version: 3.10
; Language: English
; Platform: WinXP
; Author: Matt
; Script Function: 3D window view screen saver for Vista
; Version: 1 BETA
; Date Dec 2007
Run('C:\windows\system32\rundll32.exe dwmapi.dll #105')
[ The escape key stops it btw ]
One day I may write something thats useful