Identifying Workspaces

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http://askubuntu.com – New Ubuntu 12.04 User - Having Workspaces is quite useful, but is there a way to easily identify which is which? In other words, if I have a terminal open in three of the workspaces it would be nice to have (for instance) the background colour of each workspace unique. Is there any way to do that or something similar (e.g. different wallpaper?) Thanks... (HowTos)