One of my favorite places to photograph is Great Sand Dunes National Park and Preserve in Colorado. Its a great place to extract natural abstract images built on patterns, textures, colors and forms. I made this image last Spring and as I wandered among the dunes, I was drawn to the patterns of magnetite, illmenite and other dark heavy oxide minerals that are concentrated by the wind winnowing away the lighter less dense quartz and feldspar grains. These diagonal layers of dark patches in contrast to the golden colored layers of rippled sand in the foreground combine to make an interesting graphic image. A print of this image is currently on display at the Visitor Center in the park.
Stephen Weaver Photography/Earth Systems Imaging : The Art of the Landscape 
Beautiful image.
– Dan.