My Dog Is as Smelly as Dirty Socks: and other funny family portraits by Hanoch Piven. 

It all starts with a family portrait that a child draws which she thinks doesn’t really portray all of the qualities of her family.  So instead she creates pictures out of objects that show a special quality of that family member.  The father is as jumpy as a spring, the mother as soft as the softest fluff, her younger brother is as sneaky as a snake, the dog is as stinky as an onion.  This is a winning concept.  The final portraits of each member are silly and fun, but also demonstrate an artistic concept as well as the use of metaphors. 

I would share this book with elementary age children working on metaphors and similes.  I would also recommend it for a jumping off point for art projects, perhaps family portraits made with found objects?  A gateway to folk art?  All sorts of options here.