Automated background wallpaper changes to every PC on the network.

HI,

I'm managing a small office. Does anyone know of a way i can set up all my PC's to change their wallpaper everyday?

PC's are Windows 7 x64. All PC's are on a domain. Running on Windows Server 2008 Standard

I know i can set a specific background for all PC's in my domain through GPO. But is there a way i can automate the background wallpaper to change to different backgrounds (that I specify) every day, etc?

I also know that in windows 7 there is an option to auto change my backgrouds to whatever time delays I'd like. But I don't want to go to every user and change it to that option and then direct it to the pictures I want.

BTW - I'm going to have my background pictures on a share drive, so that I can point my GPO setting or whatever to that for everybody. And I have the option to move/remove pictures from that folder as I see fit.

Thanks for any assistance.