These are 30 procedural volumetric sphere with different effects.

It took a long time of experimentation and "accidents" to create these spheres and i hope you fellow blender users can create some cool still or animations with it.  

On most of the sphere the procedural texture can be animated in different ways to make the sphere suitable for many fantasy/sci fi scenes or animations. 

Update 07.08.2017: Added three more volumetric shaders. 

Update 30.10.2018: Added two bonus video tutorial course with two  awesome projects as shown in the  introduction video below:

Make sure you download the latest 2.79 blender version from the official website before starting the video tutorial course. 

Update: 02.02.2020 I have released the Blender 2.81A version of the 30 volumetric spheres. Some shaders were changed or replaced for slightly different or entirely different ones. In my opinion, the pack is better now. All 30 Shaders are also now in one blend file for ease of use. Please note that the free added course will not be converted to blender 2.81A. It simply takes to much time to rerecord everything.      I hope you will all like the update. 

Important node: As these effects are using the emission shader, it is not possible to render these volumetric shader with a transparent background alpha. This is because of a limitation of Blender.