These are some of my favorite space images. Not all of the below pictures are taken by hubble. The compressed images below do not do these images the justice they deserve, so just click on them to view a higher resolution version of the picture. (The first three make good desktop backgrounds). Images: Mars, M51, NGC 6357, Saturn, Carina Nebula.
Just a head's up, my first feature of Hubble images are going to be galaxies. So send in your suggestions and favorites of galaxy images that the Hubble has taken (email is located at the top right).