Yeah, once I'm ready to resume coding more on Verve, I'll try to take it yet a few steps further, because there's such potential still lingering in Verve. The brush section will get pretty big eventually, or rather pretty complex in terms of possibilities. But I will see to it that it continues to explore organic behavior rather than stale repetitions or fixed patterns. BUT I may also add some structured features for more architectural motives... whatever adds excitement in a kind of natural way.
If you start playing with the brush images, there's a great deal of additional complexity. You can, for example, design a serious of images that can get controlled by pen pressure, really adding a curious degree of elegance to brush strokes and so forth. But, yeah, lots to explore for you!