This is a simple suggestion that restains stained clay and recolors wool.
This recipe will give you 8 stained clay/colored wool, which depends on the dye in the center. Any stained/hardened clay or wool can be placed on the outside. This only works if clay OR wool is in the menu, not both.
This recipe will remove the color from the wool/clay. If you use wool, it'll revert to white wool, and using clay will revert it to hardened clay. This only works if clay OR wool is in the menu, not both.
As for the clay, all the colors of dyed clay other than the earth colors are so putrid because of the undertint that I doubt I would want to use any of them in construction anyway. Besides, clay is abundant in swamps. I use it mainly for bricks.