variety is an applet for having slideshow wallpapers across many GUIs. https://launchpad.net/variety In the process, they build up a script to change the wallpaper depending on the GUI. https://bazaar.launchpad.net/~variety/variety/trunk/view/head:/data/scripts/set_wallpaper This can be the base for "xdg-wallpaper" in xdg-utils.
I'm personally interested in implemented any new (major) features in xdg-utils. I'd prefer to let variety continue to fill that role.
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