Images on Jet Propulsion Lab site open for use

I spent some time working on a site design for someone where the theme of space was tossed around a bit. I did some research and found that the Jet Propulsion Labs (a branch of NASA) - perhaps because they're publicly funded or something - allow for the open use of images gathered from satellite and robotics missions. There are a few stipulations, but giving someone a credit line for some amazing images seems like a more than fair price to pay. They even have a nice little flex gallery for browsing their collection and offer both high rez Jpgs and Tiffs.

Courtesy NASA/JPL-Caltech.

Courtesy NASA/JPL-Caltech.

I'm pretty sure that - within these stipulations - an artist would even be able to use these images as source material to photoshop to their hearts content, but rather than give you incorrect legal information here I'll just direct you over to the JPL's Image Use Policy so you can see for yourself :)