I was fortunate enough to work on a Surface team 2-day Hackathon project in 2016 ahead of the release of the Surface Dial. The goal was to explore new commanding for the Dial within OneNote.
I built a Flash prototype that integrated with the Dial. Tapping the dial would show pen tools. Twisting would change tool. Tapping the dial with a tool already selected would open additional choices. From here, twisting up or down would change pen color or thickness, depending on the direction.
A step-by-step look at the interaction details of my prototype.