1) Claymates by Dev Petty - What can you do with two blobs of clay? Create something amazing! But don’t leave them alone for too long. Things might get a little crazy. In this photographic friendship adventure, the claymates squish, smash, and sculpt themselves into the funniest shapes imaginable. But can they fix a giant mess before they’re caught in the act? Both of my kids love this book, which is all told through dialogue in live scenes with adorable clay characters that were photographed in various funny contortions and naughty antics for the spreads.
2) Goes perfectly with...some modeling clay! The Alex set is meant for kids, so it's bright and non-toxic. For a slightly older kid you could also add in some clay modeling tools.