Trouble creating fog and lighting

I am trying to create a model in unity that looks like this picture by Escher link:http://uploads1.wikiart.org/images/m-c-escher/cubic-space-division.jpg I can create the lattice however I can not create the fog and background/lighting effect. When I adjust the fog in Lighting the cubes just get more gray and I don't really get a fog effect. Also I don't know how to eliminate the sky and make the lighting more like it is in the picture. Does anybody know how to great the fog and lighting effect I am looking for Thanks