Clowns!

 Clowns are perfect for a lot of art elements.  Line, shapes, color!  Awesome!  Students were supplied with a white oval.  We began with 3 simple circles for the eyes and nose.  We drew a hotdog shape for the mouth, and colored with oil pastel. 
When the face was complete the students glued the oval onto a large piece of construction paper (right in the center of the page)... and I asked, "what's the clown missing?"  Clothes, hair, hat.... and then the students draw crazy clothes with crazy hair and a crazy hat.  What a great way to let creativity flow while utilizing art elements.