Crabby

I still don't see the shape - the Crab Nebula, from Spitzer

Rorschach

What does the dark blot look like to you? - possible lake on Titan, from Cassini

Eye of Sauron

Greg thinks this image looks like the Eye of Sauron - dusty ring (and spiky image artifacts) around Fomalhaut, from Hubble

Early Fireworks

Exhibiting a jet, one week before Deep Impact is scheduled to smach into the comet - Comet Tempel 1, from Hubble

Alignment

Sometimes, everything just lines up - Saturn, Dione, Epimetheus, from Cassini