Also a stand-alone comic book (but so much more) written by Neil Gaiman and illustrated by Dave Mckean. This team is remarkable; singlehandedly they have changed the comic book industry forever and many people who once would never have considered reading comics under the traditional stereotype now consider "graphic novels" a valid art form.
Check out Signal to Noise, or other collaboratives by these two, such as The Tragical Comedy or Comical Tragedy Of Mr. Punch, Violent Cases, and the Sandman series, you'll see what I mean.