Get dressed in old clothes before you read this one to a child, because you'll immediately want to go outside and play together in the mud afterwards. One of my all-time favorite picture books, 'Mud' has a simple, lovely, reverent text and lush illustrations that immerse the reader in the gorgeous transition from Winter to Spring, when "Winter will squish, squck, sop, splat, slurp, melt in mud." Its closing words: "Come spring. Come grass. Come green." Take your socks off, too.