The mural is airbrushed on 4 separate 1/4" MDF panels. The hands are 3" pieces of PVC styled to match a Lego character hand. The cool part is that they double as holders for three removable light sabers.
The planet is painted on the back of a piece of plexiglass with a styrofoam plate cut for backing. Behind it are three LED light bars (from Sparkfun) with a cord running through the wall to a transformed below. A future enhancement will be a switch or dark activate circuit.
I can't take credit for the artwork -- Steve is an extremely talented airbrush artist (and it shows).