Teaching day: Working in watercolors with the wet on wet paint application, and the use of a single one-inch sponge brush. The objective is to restrict the variety of color variations; and limiting the palette to a cool blue harmony. All colors will be influenced by a some quantity of blue.

The Blue Rider by Franz Marc

This is nothing original: 20th Century Expressionists France Marc and Wassily Kandinsky created paintings motivated by the colors based on this Blue Harmony...

Now, just put on some Rythem and Blues, mix yourself a Bombay Sapphire Blue Martini, and then paint away the blues!