Today's Image of Mars was taken by the Viking II Orbiter on June 7 1977. It shows wave clouds near the Martian south pole. These clouds result from wind passing over craters and picking up dust from the last global dust storm.
Unfortunately this image isn't as colorful or interesting as some, but it is important because it helps us to understand more about the Martian environment.
This photo of Mars links to the NASA's page for the photo.