Get some cardboard.
Cut the cardboard into squares and rectangles.
Paint the cardboard pieces shades and tints of the primary and secondary colors.
- My kids did 3 shades and 3 tints of each color.
- So, there were 36 tints and shades of the primary and secondary colors.
- Then, they did 14 random colors of their choice.
Paint the canvas panel whatevs.