We never saw Saturn. I used to have a model made by myself, but the Cassini rings looked pretty ugly, no, it was just one face in the shape of a ring. We need Saturn! And btw I have a skin for saturn from a program, a program that has everything released and ppl do various modifications and upload them in their site, so using its textures is absolutely ok. There's nothing easier than making a planet, but making Saturn really requires skill and I don't mean one ring when you have to make the ring like many asteroids, check SCII space terrain for your info.
http://hiveworkshop.com/resources_new/models/570/
Mars also uses a skin maybe even from the same program.
http://hiveworkshop.com/resources_new/models/911/
http://hiveworkshop.com/resources_new/models/914/
I don't see where Jupiter, the moon went. But I can do the rest if you need them, imo you can do it too, just create a sphere and skin it