One arts standard for elementary students is to learn to tint colors. My kids seemed to really enjoyed seeing how many colors they could make by just mixing yellow, red, orange and white together.
SESSION ONE: I made an egg template page (downloadable HERE) and gave one to each student along with white, yellow, red and orange tempera paint. They were instructed to see how many different colors they could make – all were to have some amounts of white in them. The eggs and background were painted.
SESSION TWO: Students were allowed to draw designs on their eggs with oil pastels, but they were to keep the same color palate as before. In other words, they were limited to the paint colors of red, yellow and orange. This repetition of colors makes the painting more harmonious to the eye when complete.