Well, I did a little more waxing and overdyed it with black, and here it is now:
Above is the side I waxed and dyed on. I got a little heavy handed with the black in spots, but I'm still pleased with the overall result.
This side is the back, and it's a good way to see that the wax and dye both penetrated the fabric, even though it's a heavier weave than the muslin or kona cotton I usually use. This is part of the scrap pile I got from my friend Joyce, and I'm going to really enjoy playing with them! Just need to figure out how I want to finish these. More to come, I'm sure!