So I am constantly trying to figure out how to distribute a layer, object population, or even clouds without the ever so clunky Fractal node. Then I say to myself, "Self - what about the Fake Stones shader? I mean, it's Voronoi based, no? All you have to do is adjust the size and density!" Well that got me somewhere at least. But still not the desired effect. So Self says, "Warp it!" Better, but still not quite there. Maybe with another Fake Stones, smaller and density adjust, either merged there or a copy of the thing with it masked and merged? Anyway for your observations. Feel free to fiddle with the clip and offer suggestions.