I made a Photoshop tutorial on creating planets in the universe. It's a simple, very basic tutorial but it's a good starting point to make your own advanced creations. My version is only Photoshop 7, though some features will also work on different versions.
You may also download the final image as screen saver, just right click and save. A complete tutorial link can be found here .
Looking at the universe makes me feel the vastness of God's creation and how we are linked infinitely with each other. It also reminds me not to give up no matter how big our problems are, because that is actually nothing compared to what is going on out there.