I rarely create and publish black and white photographs. I enjoy them, but I usually prefer to recreate my personal experience which is greatly influenced by color. Recently I submitted a color photograph of the Tonto National Monument Lower Cliff Dwelling to iStockphoto that was rejected for dull flat colors. That area of the desert has dull flat colors, which aren't very suitable for stock photography, so I wasn't surprised. However, the national monument is very interesting. So, I converted the photograph to black and white and that version was accepted at iStockphoto.