I did this project several months ago, but I forgot to post on it. I did this lesson with my fifth graders because I wanted them to learn to loosen up when they paint. Often, I find that they are so worried about making a mistake, that they don't know how to paint freely and loosely. For this lesson, we focused on Chinese Gold Fish Paintings. If you search in google images, you can find lots of examples of these. Chinese goldfish paintings tend to be very loose, and the artist does not usually sketch the fish out ahead of time.
For this lesson, my students could NOT draw with pencil. Everything had to be sketched with paint. We used liquid watercolors, but you could also use India Ink or regular watercolors. My students painted the fish first, and the seaweed second. All mistakes had to be fixed with paint. An accidental drip of paint could become a bubble, or even extended into seaweed. I told my students that, "Our goal is to make our mistakes look like they were done on purpose." I really like the loose free brush strokes in these paintings.