After about six tries with Firefox, I was finally able to upload this here with Konqueror. :P Thanks to Sakasa for making the amazing BTBX Wallpaper here on kde-look.org GPL so others, like myself, can turn them into matching splash sets. :) The original wallpaper can be found here:
The .zip file I've uploaded contains splashes for Amarok, The Gimp, K3B, and Open Office. I've also included the wallpaper and a splash template for others to make their own splashes, if they so choose!
Download and unzip the .zip file and you will see the splashes are located in the folder for the app they belong to.
Amarok: place splash_screen.jpg in /home/yourusername/.kde/share/apps/amarok/images If the "images" folder doesn't exist, simply create one.
The Gimp: place gimp-splash.png in /home/yourusername/.gimp-2.4 Obviously the "2.4" will depend on what version of the gimp you have. Change accordingly.
K3B: I had to place the splash and background included with it in the folder for the theme I was using. As root, navigate to /usr/share/apps/k3b and I'm sure you'll figure it out. :)
Open Office: I don't have Open Office installed, but the location varies by installation. You might have to try either: "whereis openoffice" in a terminal or do a google search to see if you can find where to store the splash in your distribution. Again, I don't have it installed, so someone please tell me if the splash doesn't work, so I can fix it! Thanks!