A light tan a medium brown, a rust ( rustoleum ) brown and a spritz of black.
The smaller swirls came from repeatedly trying to lift the stock out of the water and catch the paint as it ran off, which resulted in it being stringy. If I had done it correctly, and dropped the stock on the floating paint from above it probably would have made broader patterns, which is what I was trying for. Instead, I was trying to lift the stock from in the water, underneath.
Because I was an idiot I stirred the paint up and had to make dozens of passes to get anything to stick while lifting the stock up from under the paint, resulting in the thick, stringy pattern.
The end result was cool, I'd like to try it again now that I understand the process better and see what I could get.