This is the system of marking I've been using.
Light blue: mercies of God
Red: character of righteousness
Blue: temptations of the devil
Yellow: gospel of Christ
Orange: words of deity
Problem is I'm sick of it and would like to use a different system. It was very profitable in the beginning, now it's robotic.
What other ways to mark the Scriptures do you know about and what system do you use?