Margaret Mahy
Robin McKinley
Andre Norton
Meredith Anne Pierce (romantic vampire novels that don't make my skin crawl with their sexual politics!)
Diana Wynne Jones
James Thurber (The Thirteen Clocks and The Wonderful O)
Patricia McKillip (The Riddlemaster of Hed is a good place to start)

There's a very good book called 'The Stones Are Hatching' by an author I can't recall.