Sent by: MER-B | From: Mars | Sent: Sep, 2008 | Credit: NASA/JPL/Cornell | Image source
Another in a series of parting shots of Victoria Crater as Opportunity drove along its length, heading south toward an even larger feature several kilometers away. This is a composite of two false-color images.
Update: here’s another excellent, natural-color version from [...]

Sent by: Cassini | From: Saturn | Sent: September, 2008 | Credit: NASA/JPL/SSI | Image source
The upper part of this picture is the latest example of Cassini’s ability to peer through Titan’s thick haze by using special camera filters. The dark areas are mostly covered in sand dunes, and the lighter areas are mostly mountains [...]

Sent by: Mars Reconnaissance Orbiter | From: Mars | Released: Sep, 2008 | Credit: NASA/JPL/JHUAPL | Image source
The Aram Chaos region of Mars intrigues explorers because of its complex landscape and wide variety of minerals. On the left is a stretched natural-color view showing a swath of the region that is about 10 kilometers [...]

Sent by: MER-A | From: Mars | Sent: September, 2008 | Credit: NASA/JPL/Cornell | Image source
A recent Martian landscape, as photographed by the rover Spirit and rendered in natural color (top) and false color. Another example of why it’s useful to see both kinds of views.

Sent by: Mars Reconnaissance Orbiter | From: Mars | Released: Sep, 2008 | Credit: NASA/JPL/UA | Image source
A close-up view into one small section of Noctis Labyrinthus, the labyrinth of night, part of the massive Valles Marineris canyon system of Mars. The area shown is only a few hundred meters across.