Question about display backgrounds.

I'm willing to bet the answer to my question is no, but I'm curious enough to ask anyway.

I work for a school district. We have a series of brand new computers that are a month old. They came with Vista, but we pushed them to XP for obvious reasons. With the release of 7 upon is, and it's testing in our environment been positive, we're eager to consider upgrading.

We use default local profiles on the machines, with re-directed my documents folders. But I was curious - is there a setting somewhere on Windows 7 that will automatically generate a different background photo each time you log in? I thought it'd be cool if all of the systems were identical except the background image.

Just a small idea. Thanks for any help!

Roasted..

If you install 7, you can right-click on the screen, select Personalize, select Desktop Background, Picture location(your own folder if desired) and set it up to do a slide-show, set the interval from very short to very long, and/or Shuffle and you'll have a new background every "x" seconds, minutes, hours, days.. I havent seen a selection for "different every boot-up" tho..