On my Google personalized home page, I have NASA's image of the day. They only seem to update the image a couple of times a week, so I don't know why they call it the image of the day, but they do have some really cool pictures. My favorites are the ones that come from the Hubble space telescope and the ones that come from actual missions. I am constantly using these images as my desktop background.
This most recent one I thought was awesome. It was discovered in 1787 by an astronomer named William Herschel and was named the Eskimo Nebula because of its resemblance to an Eskimo in a parka. You can read all about it here.
It is such a beautiful thing, but what gets me the most is its size. We are talking about a Solar-System sized image. I can't get my mind around it. Yet all of this Universe exists in the mind of God. He created it and He sustains it. It is like the night sky is some grand canvas that He is still working on, and it puts any paint splatter artist to shame.