Gimp allows you to set the <a class="zem_slink freebase/en/splash_screen" title="Splash screen" rel="wikipedia" href="http://en.wikipedia.org/wiki/Splash_screen">splash screen very easily. All you need to do is copy the image to ~/.gimp-/splashes/. There is <a class="zem_slink freebase/en/betting" title="Betting (poker)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Betting_%28poker%29">no limit on the size or color. You just copy all the images you like to have as splash and one of them would be randomly picked up from the said direcotory for the splash image.

Here is the snippet from the <a class="zem_slink freebase/en/gimp" title="GIMP" rel="homepage" href="http://www.gimp.org/">GIMP man page.

GIMP comes with a default image for the splash screen but it allows system adminis-
       trators and users to customize the splash screen by  providing  other  images.  The
       image to be used with the splash screen is chosen as follows:


       1.     GIMP   tries   to   load   a   random   splash  screen  from  the  directory
              $HOME/.gimp-2.6/splashes.

       2.     It then falls back to using $HOME/.gimp-2.6/gimp-splash.png.

       3.     If the user didn\'t install any custom  splash  images,  a  random  image  is
              picked from /usr/share/gimp/2.0/splashes.

       4.     As   a   last  resort,  GIMP  uses  the  default  splash  image  located  at
              /usr/share/gimp/2.0/images/gimp-splash.png.

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