I have been using a dot grid spiral notebook to swatch paints & markers, which works, but I've been wanting to make cards to see colors side by side. Which is the exact reason for this class. I used a moon stamp & versifine ink pad as the transparent mark. And a metal die to cut out the circle. Labels on the front was distracting so I labeled the back. I made the cards slightly wider so I could have two windows. Great class & teacher!