I recently discovered blenders (kind of new?) feature to create meshes from volumes with an implementation of the marching cubes algorithm.
So I tried to come up with a completly procedural scene which is based on this possibility and this is what I came up with!
The mesh is created purely on the base of combined and overlapping 3d textures and then the resulting mesh is textured based on one cycles shader network, mainly split by the normal directions.
The greenery is placed with geometry nodes, same as the base meshes for the clouds and then they are made from a volume shader.