Book recommendations?

Help! I am in need of your top book recommendations for the elementary art classroom. My principal wants to beef up the art room's book collection and has given me a very generous allowance to purchase books. And she wants me to splurge for hardbacks when possible! Bless her.

So, what are some of your favorites? Help me, people.

(I'll be sharing a new project later today or tomorrow--come back soon, friends!)