I installed a Dark Side of the Moon decal on my MacBook Pro 15" and I gotta say, it rocks! It matches the wall outside my classroom.
And you know you're on to something when someone in the 2AM crowd at Denny's shouts out a compliment for your laptop. Oh, the decal is quite opaque: it blocks the light of the Apple logo. The #1 tech company in the known universe will have to muddle through without mobile advertising from me.