Cape Verde Cliffs on Mars

"Courtesy NASA/JPL-Caltech."
This picture is from NASA's Opportunity Rover which is beginning to crawl into the interior of Victoria Crater, the cliffs have been christened "Cape Verde" by NASA. The color is from "scattered light from dust on the front sapphire window of the rover's camera" according to NASA's press release. I've cropped NASA's image. If you click on this you'll get a larger version that will fit on your desktop if so inclined.