Make with GIMP 2.8 and Blender
By Chumpen Suksapar

Create a splashes directory in your in your personal GIMP folder (/home/user_name/.gimp-2.8 on Linux, C:Documents and Settingsuser_name.gimp-2.8 on Windows).
Copy your image(s) into this splashes directory. On start, GIMP will read this directory and choose one of the images at random.