Drinkcold Desktop
From drinkcold.com: Desktop:
Perhaps a handy program could be invented which automatically deleted your desktop contents every 14 days or something.
Start » Settings » Control Panel » Display » Desktop tab » Customize Desktop button. Down the bottom you can set it to “clean up” your desktop every 60 days. Not quite the same as deleting everything, and seeing as it’s part of Windows it probably doesn’t work anything like you’d expect it to, but hey, it’s a suggestion :)