Four color fern

In the Sapinsky fractals, there is an option to set the color of each vertex, and the resulting pattern causes each of the sub triangles to be a different color. In the Barley Fern fractal there are four vertices I'll be with a more complicated updating function. I'm curious what the color distribution looks like if we were to assign one color to each of the four vertices. It should be relatively simple to code up given that the downstream machinery already supports it. Let's see what it looks like.