I made an image with Blender, Cycles render engine and Gimp in Ubuntu
It was made for the Assembly 2011 Graphics Competition. It placed 4th.
<a href=http://archive.assembly.org/2011/graphics>Here you can see the winners</a>
Here's a full resolution version (3840x2160) of this:
http://www.manujarvinen.com/%7Eeternal/images/forums/blenderartists/Middleman_crisis_by_Manu_Jarvinen_fullres.jpg
Here's a .zip package with the .blend and some work in progress images. And also the full resolution version:
ftp://ftp.scene.org/pub/parties/2011/assembly11/grfx/middleman_crisis.zip