i think it looks hot.. to be honest i don't hav any stickers on mine. BUT on my WD external i have a sticker of the apple sticker on one side and a Koral Jiu Jitsu sticker on the other side...
At work people come in with MBP's with stickers on them.. either surving, or skatboarding, etc.. I think it looks really good, BUT i don't know if i want to change the appearance of PRo to a cool laptop.
Same goes for my car. I have a 335i bmw, and keeping it stock it looks luxurious, BUT i'm the type of person that likes to personalize the car a bit (MOD) so that takes a way from the luxury and makes it appear either meaner or just different. I feel same goes for laptop.
PS-I'm NOT trying to show off by saying bmw, i'm just proveing a point.