Space.com has a lovely image gallery of pictures from the Hubbles space telescope. They've done it so that you can vote for every picture similar to HOT or NOT.
What amazes me so much about these pictures is how different they all are. Granted that the pictures of Jupiter is going to be different from pictures of a nebula but within their categories all pictures are very different and at the same time equally amazing.
Try not to waste too much time on click and reading every picture. I did.