Robert Pulchik was a psychologist that used a color wheel to help categorize intensities of what he considered to be the eight primary emotions- anger,fear,sadness,disgust,surprise,curiosity, acceptance and joy.
You can read more about this in his book- Emotions and Life or here at Fractal. What is the emotion associated with your favorite color? What is the emotion asscociated with your least favorite color? Would you have assigned each of the emotions another color?