One of my favorite graphic novel series is Fables, created by Bill Willingham. The novels take familiar characters from fairy tales and fiction and put them all together in original stories with crazy twists and turns. And the art is usually pretty good, too!
Many times with retellings of classic stories I have been sadly disappointed, but not so with these books. Willingham skillfully sprinkles fun discoveries and new depths for the characters' backstories even as the main plot develops. The more you read, the more everything intertwines together in surprising ways.
I also love spotting cameos of little-known characters. I once even saw Churchy LaFemme (see Pogo)!
(note: the novels are intended for adult audiences only.)