That Victoria Crater DTM was made from Stereo observations from HiRISE - ditto the Columbia Hills animation you'll also find on the JPL website - not VLBL stereo obs by Opportunity.

As for New Horizons at Jupiter - we're got a month of downlink yet to go, and MVIC has taken data which simply hasn't been downlinked and/or put online yet. It's not possible to convert greyscale images into 'faithful' colour renditions - it's a guess, pure and simple. It can be an educated guess, but it's still a guess. There's no magical "take this panchromatic image and find the colours, faithfully" button - it is simply an educated guess based on what colour data might have been collected previously, and more than a little artistic impression.

Furthermore, one of the 'geeks' as you so nicely put it, has done the colourisation you speak of, more than a month ago:

http://www.unmannedspaceflight.com/index.php?s=&showtopic=3743&view=findpost&p=83490

Doug