The enterprise mission has just posted a claim that NASA have been altering images sent from the Cydonia region of Mars. The above thumbnail image is said to be from the same site at different times, where the first image set's detail have subsequently been removed and replaced the the second set (2 sets of 9 IR, false colour images).
Image tampering claim
They also submit the following D&M image which they claim comes from the origional and unaltered image set.
On Art Bell's radio show, Richard Hoagland claims that the false colours in this image shows differing materials, and the brightness relates to the heat (dark objects being cold, bright being hot).