Mixing blue and yellow is the best known way to mix a green, but it's by no means the only color recipe. This list of possibilities will help you expand your repertoire of greens, get you closer to that elusive "right" green, the one that Picasso was talking about when he said:"They will sell you thousands of greens: Veronese green and emerald green and cadmium green and any sort of green you like, but that particular green, never."