This is a great lesson on color mixing, as well as teaching about tints, shades, hues, and even free-form shapes. I make it super easy for the 3rd and 4th graders by walking them through painting free-form shapes to create a flower by placing one shape in the middle, and painting flower petals around the shape. Next, I give each student one brush for their color, one for the white, and one mixing brush. I had them paint the end of the petal white, the bottom of the petal with the color, and then in the middle, they put one dab of color and one dab of white and mixed it together with the mixing brush. Breaking down the project like this, makes it simple enough for the younger kids to learn how to blend colors together.