There are sketchbooks and then there are sketchbooks. I've never kept one but the project I'm working on right now is kind of sketchbook-like so it's on my mind. I've had this guy's book on my shelf for some time and it's AMAZING.
My book is bigger than this but you get the idea:
It looks like he also did a music video for a group called Big Zis:
Check this guy out!