No lesson, but could do one on shading and make with diamond shapes for the colored pieces, or various shades of the same color of tissue paper, for something more simple. Have kids draw a large outline of a shape of their choice to fill in.
LOVE THIS IDEA! Using paint sample cards, pixelate a picture in photobucket and using the paint cards, make this awesome piece of art in your home! Google "how to pixelate a picture" if you don't know how!