Wizard of Oz is one of the most fantastic sources of inspiration for so many artists, right up there with Alice in Wonderland as far as modern day mythologies and fables go. The Design Inspiration has a collection of artists' take on Oz which I love.
Found via Lines and Colors Blog.
For more story influenced inspiration check out Terrible Yellow Eyes, a place where some brilliant illustrators throw their hand at Maurice Sendak fan art.
Or just go straight to Rackham, the greatest artist to ever to take on Alice in Wonderland and so many other fables.