maybe:
http://en.wikipedia.org/wiki/Color_psychology#Uses_in_marketing
then scroll down to green 
why chess.com is green ??
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Feb 28, 2014
0
#2
Chesstempo.com is blue
You ask too many questions :P
VivaChe wrote:
Very interesting!
A lot of pool tables are green
Why is it green and not red ?? Is chess.com involved secretly with Greenpeace ?? Only that could explain such a friendly and familiar behaviour tendence between staff and members.