Here's a couple of cool pictures I pulled off a NASA web site I belong to.
http://antwrp.gsfc.nasa.gov/apod/archivepix.html
The 1st is of a Nebule/Star Cluster called Thor's Helmet
The 2nd is of the Aurora Borrelus over an erupting Volcano in Iceland back in 1991.
There's some really cool Mars pictures on the site too, from the Mars Rovers that are going on their 3rd year, of which they were only expected to last 6 months.