This asset pack is a little esoteric, but interesting nonetheless.
Roger Bootsma writes:
Hello my name is Roger and over the course of a year i have been experimenting on and off with blender cycles volumetrics.
Once in a while i stumbled on some really cool procedural volumetric shaders that works well on spheres. They are well suited to be animated according to your creative needs. Below a Video demo:
I have collected 28 of them and made them available on the Blender Market here.
These shaders could suit well in any sci fi or fantasy scene. Perhaps they will look good in blenderguru's fantasy competition :)