I just have random stickers as it's easier to find your laptop in a pile of uniform MacBooks in security lines or at work. Also sometimes it's a good conversation starter if you are at a conference or cafe and people recognize one.
Mine is easily identified in a tech conference as the only one without stickers.
The Grateful Dead had a similar issue with trying to find gear at festival shows, so Owsley "Bear" Stanley and friends came up with the Steal Your Face logo.
Proving my point that people will recognize niche stickers :)
Never personally seen a wcd sticker in the wild but once I was visiting a stately home and saw a guy sporting the MTV logo style wcd T-shirt. Possibly the first design they did?
Yea I have that shirt too. Don't think it was the first design, there were a bunch of others before that from what I remember and can see in my collection.
Aha, I may have just assumed that because it looked very well worn :-)