Nodevember
Nodevember is all about procedural awesomeness and challenging yourself to improve your procedural skills. Every day of the month there is a new theme to make a render for. For all renders no external data/images were used, only nodes and math. I chose to use blender 2.8x to make my renders since the node editor is very powerful and flexible.
If you want to poke around the blender files, you can. Download them from Gumroad for free.