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I did a quick test with bitmap driven cloudlayers, then you can create any shape, depth or multiple layers.

Here is a quicky inspired on the "Pillars of Creation"  Just a rough try.. but i think you can get good results when you start adjusting the quality, roughness, feathers etc..  just making advantage of the cloud settings at you're wishes.

Just draw it in a paint program and use that in the function editor to create any cloud in you're shape, turn of repeat so you get a single cloud,  Point the camera to the sky.

That looks cool and promising, Cherryman!

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