So, some time ago I posted about guy who made a mosaic based solely on Rubik's Cubes. Well, turns out, he's not the only one. After a bit of research, I found out about the world record - 12090 cubes. Now that's dedication! Or insanity. But awesomeness for sure!
Also, underground French art movement Space Invaders apparently make those too. More on SI coming soon (I hope!)
Check out the source for more: http://www.space-invaders.com/rubikubism.html