This tutorial consists of 3 main sections.
Section 1: How to create your own diffuse and bump map for the gas planet surface.
Section 2: How to set up a scene in blender for your gas planet
Section 3: How to create a transparency map for the rings, and render the final image.
All of the above sections require blender (I am using version 2.56) and Photoshop, or Gimp
For this tutorial you will need a general knowledge of both blender and Photoshop (or Gimp), and hopefully a bit of common sense.
To read the rest of this tutorial, you can download the free, 20 page PDF file HERE.
This tutorial was created, and kindly shared by Jon Dawe.