There are case mods, and then there are works of art.
This Wall-E case mod is a work of art. Created by German tinkerer Thechoozen, Wall-E is a fully functioning computer housed in a case composed entirely of sheet metal and an RC unit, allowing the cute little contraption to move around. Thechoozen even included dual webcams behind the eyes of Wall-E, allowing it to capture 3-D POV video of everything in its path.
Thechoozen posted step-by-step documentation of the creative process (here) on the bit-tech.com forums. The evolution of the mod is definitely an interesting read if you have the time. The sheer number of steps involved in creating Wall-E is staggering.