Sialia said:OK, I'm bad.
Fortunately, I don't have a copy of my current sketch on my machine here at work, so all I could do was fool around with the layers and some test patterns.
So the answer is, yes, I can set a black and white pattern on the "background layer," and then make a new layer and fill a 50% transparent color over the selected area, and then 10% clone stamp the detail of the background layer into better resolution in selected areas of the top layer.
Worse, I can make multiple layers each with a different transparent fill color and then swap around the source layer of the clone stamping to blend the colors on the topmost layer.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.