Accessible colors based on https://www.s-ings.com/scratchpad/oklch-smooth/ .
Get the color string for each color in a palette. Use all shades for a given color before moving to the next color. This is usually recommended since the user will be able to distinguish different shades if the colors are near each other.
Get the color string for each color in a palette. Always skip color, move between shades after all colors were used. Shades are also slightly moved in a circular fashion to achieve more contrast.