This video is a very dramatic introduction to the primary colors. It also includes mixing. The stop motion, music, lyrics, and visuals are very appealing for Prekinders.
This picture was chosen for a slideshow in primary colors I created for my guiding question Weebly, Playing with Primary Colors. "Play is the highest form of research." Albert Einstein
At the 2008 Serious Play conference, designer Tim Brown talks about the powerful relationship between creative thinking and play -- with many examples you can try at home (and one that maybe you shouldn't).
Color Collages
Have children search through magazines for red pictures, and glue them onto red construction paper. Do the same with each color and use these as posters for the classroom.
Another Idea: Cut fabric of different patterns and colors into 1-inch squares, and give children different colors of construction paper cut in half. Make sure to have several patterns of each color fabric (ginghams, stripes, florals, plaids, polka dots). Children glue the pieces of fabric onto the matching color of construction paper (blue fabric on blue paper, yellow fabric on yellow paper, etc.) These can be made into a book or quilt.