----- Original Message -----
From: "Ryan Lane" rlane32@gmail.com
Green has a meaning of "Go" or of "this is ok" in many cultures. Making either side green gives a bias to the diff. Similarly with red. Red means "Stop" or "this is not ok". Many people associate red with blood, and green with nature.
And in some cultures, yellow signifies death or cowardice.
It's almost impossible to completely disambiguate cultural cues for something the size and spread of Wikipedia, except possible on a wiki by wiki basis; I mentioned it only for completeness.
That said, the original complainer's original complaint was that the yellow in question *was not changed* to complement the chosen blue, in his estimation.
Cheers, -- jra