"posterize" them, simplifying the color palette and allowing me to
replace with the color of my choice. This seems like it could be the
beginning of an interesting pattern with the needles in circles of
different scales and different colors. I'm also imagining a
herringbone-ish pattern and a random "leaf litter" pattern I think i
need more diversity in my shapes, but i'm more confident that this isn't
going to look a mess.