So one of my coworkers drew Godzilla attacking it, and then another drew planes shooting Godzilla, King Kong-style. The first then drew a little Pikachu on his locker and invited me to vandalise it as I saw fit, so I decided to attempt a more realistic Pikachu in response:
After that, people started requesting things. Something with Hello Kitty, some recogniseable piece of modern architecture, a rabbit, a polar bear, a guitar, a giant cock (many a bad pun was made concerning the rooster, of course).
Anyway, I like how it's turned out, and I really like using dry erase marker. Shadowing and texture become exercises in resourcefulness, and of course, the marker usually erases itself if you go back over it. I recommend giving it a shot, especially if you work in a boring, soulless, corporate office :D