I'm a huge fan of fairy tales and especially of the "Golden Age" of illustration, and Edmund Dulac is up there as one of my favorites.
I love the colors, lines, composition (love the simple way of blocking out fields of color) and subject matter (I'm a sucker for fairy tales). I really dig the influences of Pre-Raphealite techniques and Art Nouveau / Arts and Crafts design as well.
Images from Edmund Dulac Art Images (which include prints for sale)