I poked around online and found a few that were aesthetically pleasing to me, and finally settled on a simple grid format. I like simple!
My daughter, the math lover, asked if she could make the grid. She graphed it out, leaving some space on the left hand side of the paper just in case I wanted to paint a small design there later. You never know! I currently have sixteen colors, all are Winsor & Newton Professional.
The center diagonal line marks the true colors, straight from the palette. All of the other colors are mixed with the intersecting color, a blend of two colors.
It takes quite a bit of time to complete the chart, about two hours. There is a lot of mixing of colors, and a lot of clean-up once my palette is full up. I also wanted to move slowly as to not mess up.
I thoroughly enjoyed this process. I gasped in surprise at the colors combinations, never really expecting a few of the resulting mixtures. This is why you make a chart!
And it's not just about the color combinations either. I saw first hand the way some colors behave when mixed, and how they dry. I learned, fairly quickly, that I'm not a fan of Cerulean Blue. While it's a lovely color on its own, it just doesn't play nice when blended.
I'm going to hang this on my wall next to my desk as a reference, and just to stare at because it's pretty!