I filled out my collection of Copic markers the other day, I still have a few from the warm scale on order that should be coming in by September. Anyhow, I use the back page of my Frosst sketchbook as a palette so I know the colors an their relationships. As you can see below, I have quite a nice collection started. I will add more subtle hues as I need them. You can see the missing warm gray scale on order in the bottom right. The color guide in the pocket is by Copic, a great way to keep track of what you have and what you need.