Now I show the WIP at the level where both the green and orange prefab .gih brushes have been applied and I have painted some lines with the paintbrush where the color has been set to a gradient that features purples. Everything is in different layers to facilitate cleanup with the eraser as needed. I can see a purple line where I forgot to erase it off some blue. I'll have to go fix that now.
Below I think is done except for going through at high magnification and cleaning out all the little boogers of stuff that isn't supposed to be there. I'll save the final at larger dimensions because it seems like the way it's done over in Environment of the Week.