Did this over the course of a few days in blender 3D. The entire thing is procedurally generated. Breakdown down below.

add a layer of volumetric clouds, the method i used is similar to what you can find in this tutorial I made: https://www.youtube.com/watch?v=MNt0s7zgMFI
and the texture I used you can find in my discord server: https://discord.gg/EVJ8ytNEBN