I love reading
Neil Gaiman, although I've never read any of his graphic novels.
Another favorite is
Jim Butcher, he writes a series about a wizard for hire in Chicago. A friend described them as book crack, and I agree!
Charlaine Harris writes a great series about vampires - completely different than any other kind of vampire novel I've read, and funny! I like her other books so far as well.
Christopher Moore writes some outrageous, fun books! I got hooked with his first, Practical Demonkeeping.
Matt Ruff is another author that really takes a different, quirky approach to a story. I haven't liked all of his books, but I would definitely recommend Fool on the Hill.
Tom Robbins is another favorite, with Jitterbug Perfume topping the list. Some of his books are too trippy to tolerate or follow, but I love the ideas behind them anyway.
There are others I really enjoy too, Tony Hillerman, Michael Chricton, Elmore Leanord, Carl Hiaasen and occasionally Stephen King.