I personally love having so many options. However, I've never tried changing my desktop's splash screen.
Well, yesterday I decided to see if I could add a little variety to my desktop for its loading sequence.
Changing splash screens is very simple in KDE. You just go to System Settings, and once there, you click on "Workspace appearance" under the category labeled "Workspace Appearance and Behavior".
In the left panel of the window that opens, you choose "splash screen".
That will take you to the managing options of that category. In the center panel, you'll see your installed splash screens. If you want to add, delete, or even try some of them, you can do it by clicking on the respective button below that panel. The rest of the window is a preview of whatever screen you select.
One important detail: In case that you download a new splash screen, you must decompress it and place it in: /home/your_username/.kde/share/apps/ksplash/
Have fun! ^___^