I assembled a series of swatches that are based off of the limited Anders Zorn color palette of Yellow Ochre, Cadmium Red Medium, Zinc White, and Ivory Black. I decided to upload the swatches so anyone could use them here: http://www.mediafire.com/?9h4j6n4ngwqabgp
If anyone isn't aware of Anders Zorn or his palette, here are a few examples of his paintings:
Below is a painting that I did while experimenting with the swatches. Enjoy and post your results!