The Colors of Voice
Watch this fascinating TED talk by designer Jared Ficklin:
Ficklin shows us a visual representation of four Nirvana songs, demonstrating how vocal and instrumental contrast can be seen through colors.
Your voice also contains an infinite number of color variations. When you speak, try to use the full range of vocal colors. For example, sometimes you want to speak in cool tones (blues, greens), while other times you may wish to bring out the warmer tones in your voice (reds, browns).