Hello! I have an idea about desktop background settings for KDE: wallpaper groups in Control Panel! (a few weeks ago it was added to kde-usability lists)
There are some desktop programs like this on Windows platforms, but not in control panel. It will be cool if it comes with KControl. Also it will be more usable. Wallpaper management will be easy. Groups can be easily created by using directories. Of course this will be easy to manage groups manually.
Perhaps in the future www.kde-look.org can be rearranged to manage and download wallpapers under groups. (may be groupped ten by ten, then zipped to allow fast downloads)
A small problem:
I don't know programming and of course I won't do anything about my idea.
We're looking for a volunteer! :)