This is a wonderful lesson I saw on a Blog called Mini Matisse and I was very pleased with the results. It took my students about 5 class periods because I am kind of a Nazi about coloring with markers and making sure every single spot it covered. I am also the same with crayons and colored pencils. My kids say "I'm done!!" (how many times have you hear that?) Then I always point out the white gaps left behind and say "No, you're not!" Then comes the heavy sigh...anyhow, we play this back and forth game until I am fully satisfied with the results. They were so lovely almost the entire grade got theirs hung in the hallway, even the kids who aren't very artistically gifted.
Also, I must note that at many times during this lesson, my room was almost completely silent because they were so deep in concentration, which always creeps me out because that almost NEVER happens in art!