https://i.ytimg.com/vi/o7SdmYKirLI/hqdefault.jpg
Blender Tutorial : http://www.blenderguru.com/how-to-make-a-realistic-asteroid/
In this tutorial you will discover:
How to effectively use the displacement modifier
Why particle systems are your friend
How to spice up a boring scene with the compositor
source
Link to this post!