A vibrant cel-shading palette for almost any use!
I use NixieSeal's cel-shading palette (original link no longer available) for almost all of my work, so I figured instead of always having to open the image to pull colors, I'd just compile it into an easy-to-use color set for CSP.
There are a lot of colors in this swatch, all grouped into sets of four (a highlight, base color, shading color, and darker shading or lineart color). There is a wide variety of colors to choose from, starting with monochrome, brown, and metallic/reflective colors and then spanning the rainbow.
For best results, set your Color Set window to show rows with a multiple of four colors!