Blegh, my response was eaten - I'll add a flag to the first post and retype the reply tomorrow.
That's a good place to start!
Standard: Circle, square, lens
Stretched: Ellipse, rectangle, line
Simulated/Stepped: Stars and crosses, cubes, spheres, cylinders, cones, triangles, pyramids
We're working with single signal, function based, simple geometric plots. I think multiple signals and different standard shapes are coming, though. That said, here are some early observations on brush creation:
1. Black Ink is GREAT for geometric splatter art.
2. Dynamic, interesting lines are very straightforward.
3. Gradients within the stroke are easy to manipulate.
4. Shaders are easy to create, but blending is tough. For one, opacity merging in a stroke doesn't exist. Two, mixing dissimilar colors can be a real shot in the dark for non-professional artists (like me!). Instead of refined blending, especially over large areas, Black Ink is better suited for quick stroke based blending (say, opacity or value from pressure). I think when we get the stroke editor we'll see some features that help in that regard. I hope to see something like redefining the stroke length parameter as the entire new stroke length [0,1], instead of the predetermined measure that can exceed 1. Then we could do some custom gradients in an area pretty well.
5. High frequency plotting should be avoided unless necessary, since it can be hard to tie into the brush settings and can get crunchy.