The multiple desktop feature is really helpful, especially in single-monitor setups such as laptops. However, when navigating using the Ctrl+Win+Left and Ctrl+Win+Right it is often difficult to figure out which desktop is currently active. (Switching using the Win+Tab or Task view button helps).
Also, for cosmetic reasons and identification, enabling the user to set up a different background image per-desktop would be really elegant.
Some configuration for the desktops could be needed :
* To Be able to set a name to the desktop (while being in task view seems a fair place to set these)
* Display a quick overlay of the desktop's name when switching destops using Ctrl+Win+(Left/Right)
* Adding some UX to the Preferences > Background category in settings app in order to set these, either globally or per-desktop