I’ve had a look at Ghibli trees , there is also Ghibli clouds, but not sure about the way they look. I’m going to try and mix the two and see what I can come up with.
I was already thinking of using metaballs. Worthy of a try.
Using the usual volume cube it tends to break apart on the thinner sections. I’ve seen it done now with meshes so I will definitely look into this method.