Hey there @Graeme_VR! With a little bit of elbow grease you can actually pull this off with volumetric clouds, but it’s not going to be quick or easy. Now most people only know about using volumetric clouds out of the box, which work great but you don’t have much control of them, how their seeded or shaped etc. right? Well you can actually take back a bit of control using a trick from this video I have below. That said it still won’t be easy even after you have control and you’ll have to generate custom shapes.
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and the documentation so you can read up if you’d like!
Hope this helps!