On the Quest to XP, I added The Hobbit to my reading list. It may not be directly related to art, but it is fuel for the imagination. Of course The Hobbit ranks a solid 9 out of possible 10 in reads.
I found it helped get me through the re-writing of The Bogey of Brindle, and inspires some different looks and approaches to some up-coming art projects. This was well worth my time to add along the quest for XP.