The following backdrop comes from a fun little game called Puzzle Pilots, freely available for iOSAndroid, and Kindle. As addictive and fun as the game is, I have to give mad props to Vladimir Vasilevski the designer behind the game, for creating a world with a real spirit. I will try and reach out to him, if he would be interested to create a tutorial for how he made the planets, since I really love the style.

What you are getting right now is editable PSD file, with all the planets used in the image below, so you could arrange them as you see it fit and create your own backdrop. Also did I mention that you can download the game for free right now?