This is the direction I decided to take. I am going to plasti dip them flat black, and then I am going to hit them with 2 coats of plasti dip copper metalizer (I had to buy it on Amazon). It should give it a nice dark bronze color.
This is the color I am going to go with:
It is darker than the OEM TRD wheels on toyota's website, but I think I prefer the darker bronze look.
I also found some suitable spline drive lug nuts on Amazon. I got them in flat black, which I think will look cool with the bronze wheel.