Depending on yarn quality, there are different yarn colors available and in stock. Because the yarns are already dyed, you can only choose colors from the color palette available.
100% organic cotton
100% cotton fine
50/50 wool / acrylic blend
E.g. acrylic yarn has a palette with 26 colors to choose from, wool/acrylic blend has 15 colors, and the fine cotton palette for fineknit sweater and fabric has 29 colors.