Igor Asselbergs (who writes at http://www.livelygrey.com) has written a super guest post at COLOURLovers.
In it he highlights Aemelius Müller, professor at the academy of Winterthur, Switzerland, who devised a formula to predict the appreciation of a color-combination. Or put another way: “Müller was able to predict which combination of colors most people would probably like.”
Here is a preview taken from the article:
Read on to see how to better predict ‘common taste’. The COLOURLovers blog homepage is here, and gets a hearty recommendation from me.

[...] To compensate the desaturation, the value/brightness needs to be scaled in HSV to match. It is important to maintain a strong contrast in brightnesses, so attention to natural brightness is helpful in picking appealing colour schemes and palettes. See this article on Müller’s colour brightness theory: http://rawstylus.wordpress.com/2007/09/03/predict-the-appreciation-of- a-color-combination/ [...]