This VIS image of dunes in the north polar region was collected in early spring. Frost still covers the dunes.
Photo credit: NASA/JPL/Arizona State University
Note: The dunes in this photo are called barchan dunes, and are pushed along by the wind in the direction the two horns on the sides point toward (in this photo, to the northeast). For a similar photo, see Barchan Dune Field in Arkhangelsky Crater.