So, green. Parallels can be drawn with anything from religion to nature. The color receptors in the human eye are particularly sensitive to it. I would have to say it's a pretty prominent hue on the color spectrum.
There are lots of different variations of green as well. Some really nice ones, such as a deep-sea green or even a turquoise green.
I would imagine the general connotations of the color green are something along the lines of prosperity or forests.
mmmm.... green forests =)