It seems like I will never get to the end of my green roving pile. Maybe I got to much of it, nah. I took the second bobbin of the green singles and tried Navajo plying it. I read about it when I was on the Yarn Harlot's web page. She linked to a web page called The Joy of Handspinning that gives a good demo of how to do it.
On the left is the green stuff in two ply on the right is the green stuff plied using the Navajo plying technique