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There was a programming competition to program as simple as possible simple software that will use every color in RGB exactly once. NewScientist covered the winner of that competition here:

http://www.newscientist.com/article/dn25167#.UxeJmPl5PpF

Here is a video of the process: http://www.youtube.com/watch?v=JBk6McexwKg

Basically, the winner has accidentally found a beautiful variation of what looks like diffusion-style images.
There is a vague description of how it works in the above article.

Here is a full-sized image of the result:
https://lh6.googleusercontent.com/-2km3zePZhd_Uv6IABUP029ZIJwepNPNlffoQ1CnW9MDguZ3bZ8gQFy4QrSLiU0cAj_wIzTd2DU

though apparently, not everybody can view this link - I showed it to somebody who said it was Error 403 - Forbidden.
So here is an alternate link of it:

http://puu.sh/7kbai.png

It's 2056² px, so rather big.

EDIT: The actual competition is, as I could have guessed right away, from Code Golf Stack Exchange:
http://codegolf.stackexchange.com/questions/22144/images-with-all-colors

Beautiful fluff!