I liked this lesson because it built up color, showed them how to apply texture and used very little black. If you are looking for the lesson it is here http://www.drawspace.com/lessons/view/y02 . If you haven't discovered drawspace, it is a great site for short lessons that allow kids to work and learn at their own pace. I don't use it all the time, but I do have a few lessons that I really like from there. I think I will be keeping this one for future use.
Here are a couple of my favorites that the students created.