You can still do it in KDE 4.x, but you do it in a different way since 
the background is now provided by a plasma widgets (plasmoids).

If you want to put different stuff, including backgrounds on each 
virtual desktop, just go to System Setting -> Workspace Behavior and 
pick the Virtual Desktops section from the left.  Then just check off 
"Different widgets for each desktop"

Then all you have to do is setup a widget such as Desktop (The default), 
or folder view on each desktop and set the appropriate background for 
each desktop.  It's actually a LOT more versatile that the old way of 
doing things, although admittedly a lot less obvious.

Better yet, setup a separate Activity and you can then flip back and 
forth between large sets of tasks opting to hide programs started on one 
activity from the other activities or not.

This will also let you flip back and forth between a netbook type 
interface that you have dialed in for web activities and a more 
traditional desktop for other activities.

Brian Cluff

On 05/08/2011 08:51 PM, ChasM Marshall wrote:
> Hiya,
>
> I've had lots of fun installing distro after distro,
> some of which have had severe limitations,
> some of which are really well-thought-out systems.
>
> The window manager seems to contain my main Linux issue.
> In ignorance of Unity, the one question I have for
> experienced Linux folks only concerns the *workspace switcher*.
> Or maybe you call it the *Desktop switcher*.
> All the GUIs have it. None flaunt it. In fact, most are
> now hiding it. New composting effects with Widgets prevent
> users visualizing multiple Desktops. By that I mean:
>
> *Why is there no ability to set a different wallpaper to each Workspace?
> *
> IMHO only KDE 3.x can do this. (v.4.x removed it.)
> The average Microsoft/"Power User"/ is floored when they see it.
> Has Gnome ever been able to do this? Not that I've seen.
>
> It's my opinion that multi-workspace SHOULD *default* to multi-wallpaper.
> And why not? What's your opinion?
>
> (-: Chas.M. :-)
>
>
>
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