In this series of articles, we've gone over making custom transitioning slide-show backgrounds in different desktop environments. So far, we've gone over GNOME, KDE3, and XFCE. This time, we'll do the same task in KDE4. I think that it is easiest to do this KDE4 compared to all of the other desktop environments.

Right click on the desktop and select "Desktop Settings".

Change the wallpaper type from "Image" to slideshow.

Click on "Add Folder" to add the folder that your images are located. If you don't want to include the default /usr/share/backgrounds folder as well, remove that folder using the remove button.

Browse to the folder you wish to add, and click on "OK".

Select the image interval and image positioning, then select "OK" to start the wallpaper slideshow.

KDE4 appears to monitor the image directories that you choose, then selects at random from the wallpapers in those directories to establish your background. Enjoy!