Kindergarten did the Georgia O'Keeffe lesson I've shared on here in years past. They start with a dot in the center of the page, and draw six wavey lines coming from the dot. They then pick a plate of paint that I've already pre-dispensed(I try to have a variety of color combos). Everyone gets white to create tints. I showed them how to mix their colors on the paper, and to paint from the center point out to create a "flow". At the end of class we discussed what tints & shades were, they were given a color & had to tell me what two colors made it, and then just other random color knowledge.