Thanks! For the lazy people :-) execute this in your trunk image to try 
it out:

   World color:
     (InfiniteForm with:
       (HTTPSocket httpJpeg: 
'http://ftp.squeak.org/trunk/backgrounds/swp.jpg')).

If you like it run this to make it the default:

   MorphicProject defaultFill:
     (InfiniteForm with:
       (HTTPSocket httpJpeg: 
'http://ftp.squeak.org/trunk/backgrounds/swp.jpg')).

Cheers,
   - Andreas