From time to time you will add various image files from somewhere on your system as background images. At some point in the future, you may want to understand how to get them out of that combo box list labeled “Picture:” below.
The poor man’s cheat is to simply rename the file from A.JPG to B.JPG and the entry will “appear” to be removed from the list. The truth is, the entry is still there, but only verifiable entries are displayed. The information which populates this particular combo box is squirreled away in the file plasma_disktop_appletsrc. Under Karmic Koala (9.10) KUbuntu it can be found under .kde/share/config. Please note that the leading “.” is actually part of the name and indicates a hidden directory. If you are going to search for this file from Dolphin you need to turn on the little checkbox which tells Dolphin to show hidden files.
Once you have opened the file in your favorite text editor, you need to search for userswallpapers. That is the variable which contains the full path and file name of every item which will show up in that combo box. Simply delete the entry or entries you wish to remove.