My dorm room was invaded!
I decided to make a Space Invader alien out of purple Post-It Notes today. It was quite awesome.
I found a really great website that has high quality wall decals. The majority of their selection is simply decorative, but they also have some cool, geeky ones (in the "kids" section, mind you). They have Space Invaders, Asteroids, Mega Man, Super Mario Bros., but the coolest one they have are the TRON WALL DECALS. Oh my goodness! They have the Original TRON as well as TRON: Legacy!! $45, though? Ouch.