Yes, you can mix all the colors. We designed the HCL Henna-Herbal Spectrum Series to match the most popular colors (colors that really express the rich Henna & Herb combo). But everyone wants a choice!—so go ahead and make a unique personal color. Tip: It's always best to stay within the same color family. Add a Tbsp of Pure Henna to warm up a color, or add a Tbsp of Pure Indigo to darken by a shade or two and so on—create what you want. And please note: these are pigments that do dye your hair. Your personal color combination may have unpredictable results. Especially on heavily damaged hair. Be smart and have fun!