Just a simple splash screen for GIMP that I made for myself and decided to share with you!
(Optional)Back-up the default image:
Linux: # mv /usr/share/gimp/2.0/images/gimp-splash.png /usr/share/gimp/2.0/images/gimp-splash.png_backup
Windows: Go to C:\\Program Files\\GIMP 2\\share\\gimp\\2.0\\images and move/copy the file to somewhere else.
Move/copy this image to the previous directory. Enjoy!