Workspaces is a new, US$7.50 Mac OS X app designed to help you better organize files and folders in a visual manner on your Mac Desktop. It works as another layer on top of the regular OS X Desktop/Spaces paradigm.
SaneDesk allows you to assign specific icons to be visible and positioned when a workspace is selected. Each SaneDesk workspace can have a separate background.
The app supposedly doesn’t modify, move or copy your desktop files and folders. As soon as you exit SaneDesk, all files and folders will be visible again, no matter to what workspace they were assigned. Go to http://www.sanedeskapp.com/ for more info.