First graders read the book A Pair of Socks by Stuart Murphy and illustrated by the iconic Lois Ehlert - it is a story about finding a matching pair. See another pair of socks at Dolvin Art Knight.
In Artalezo Art class, second graders read the book Mister Seahorse by Eric Carle. They noticed how he made a collage by cutting and gluing different types of painted paper together. See the other seahorse at her blog.