I used to do a watercolor lesson with High School which was based on
the work of Paul Klee.
The students would divide a piece of watercolor paper into 4 horizontal
sections. They would then lightly draw letters to divide the space.
They could take a poem or saying or their name. After the paper was
divided into all kinds of interesting spaces, they would paint in those
spaces mixing different colors of watercolors. It was just an
interesting way to do some color mixing and work on getting transparent
washes before doing more watercolor. The letters were not supposed to
be apparent when they finished. I found some of Klees work where he
used this technique and showed it to the kids for examples.
Montwood Middle School
El Paso, TX