Green

Green is the color of nature, fertility, life. Grass green is the most restful color. Green symbolizes self-respect and well being. Green is the color of balance. It also means learning, growth and harmony. Green is a safe color, if you don't know what color to use anywhere use green.
Green is favored by well balanced people. Green symbolizes the master healer and the life force. It often symbolizes money. It was believed green was healing for the eyes. Egyptians wore green eyeliner. Green eyeshades are still used. You should eat raw green foods for good health. Friday is the day of green. Green jade is a sacred stone of Asia.

Green is the national color of Ireland and is strongly associated with that country. Green also has close associations with Islam. Because of all the green in nature the color is reminiscent of Spring. Coupled with red it's a Christmas color.

Cultural Examples:

China: Green hats indicate a man's wife is cheating on him, exorcism
India: Islam
Ireland: Symbol of the entire country
Western: Spring, new birth, go, Saint Patrick's Day, Christmas (with red)

http://webdesign.about.com/od/color/a/bl_colorculture.htm
http://desktoppub.about.com/cs/colorselection/p/green.htm
http://www.crystal-cure.com/green.html