Okay, this is me going O/T:
You could use a photo of a cloud in a composition, by using Xara or an image editor such as Photoshop or (the free) Artweaver to isolate one cloud in a photo you take, and then make the background color black and the foreground white, a greyscale image so to speak.
Then make the image Screen mode transparency. I've included an example here in this XAR file, and here's a thumbnail:
I've used the image twice in the Xara file. You could rotate it, use the Contone feature to tint it, just use the image as you'd use any shape you draw ing Xara, right?
My Best,
Gary
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