Has anyone called forth a demon using clouds as a base to materialize? I was thinking more than scrying clouds but dramatic manifestations.
Nope, haven’t done it - or even thought to - but I cannot think of a single valid reason it wouldn’t work! Let us know how it goes… 
The main impediment here that I can see is the obvious distance between the Operator and the clouds. Now, fog is another story. You can produce magnificent materialization in fog!
E.A.