Reference Colors

Here’s a question for all you fellow forgers out there… How do you set up you’re reference colors… Do you think it even matters… As for me I’m caught in between… I think they could have their uses when you start getting into more complicated terrain but other items it feels like too much… As for colors I generally work with the rainbow starting with direct colors Ie red, orange, yellow, green ,blue, violet starting from top to pathways… Then I repeat with darker then lighter colors all the way down… Not the most effective use my the tool but it works for me… Anyways, thoughts please