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Coolors - The super fast color schemes generator! Colourcode - find your colour scheme. Official color codes for the world's biggest brands. Color converter [HEX / RGB / CMYK] Pictaculous - A Color Palette Generator (courtesy of MailChimp) Color Harmony: Why Hulk Wears Purple Pants. Color harmony is the theory of combining colors in a fashion that is harmonious to the eye. In other words, what colors work well together. It is the reason the Hulk wears purple pants. It is the reason the original X-Men had yellow and blue uniforms. It is the reason behind almost all color design decisions. The Color Scheme Designer.