Illustrator :: Generating Randomized Shapes Or Edges

I'm trying to generate random billowy shapes (like cartoon clouds or bushes) by simply creating a shape and applying a some kid of brush/pattern/style/script/whatever to it and getting a look like in the below links.
 
The look I'm trying to achieve is visually simple: [URL] ....
 
I can easily draw those kinds of things by hand, however I want to be able to generate such shapes randomly.
 
Is such a thing possible? Are there existing brushes/patterns/styles/scripts that can pull this off? So far my search has come up with nothing, unless I'm searching wrong.
 
Generally I'm aware of what brushes and patterns can do, but as far as I can tell they always generate the same results each time you use them.
 
Perhaps a script can be made to do this?
 
Essentially a cloud could be drawn as a bunch of random circles grouped together, then all of them get merged into one shape.