We read Pete the Cat: I Love My White Shoes by Eric Litwin. In this funny story, Pete keeps stepping in different places and his new white shoes turn all kinds of predictable colors. Mouse Paint by Ellen Stoll Walsh and White Rabbit's Color Book by Alan Baker both showed what happens when the primary colors - red, blue, and yellow - get mixed! In Little Green Peas by Keith Baker, the green peas experience all sorts of colors in their world.
The base of our suncatcher was a paper plate with a cut-out center. Contact paper was attached to the back with the sticky side up, so children could easily stick on colorful circles and squares of tissue paper. When the suncatchers were finished, we held them up to the window to see how the overlapped pieces made new colors!