Are you a true blue friend? Green with envy? Or maybe you're seeing red? We came across a nifty site Sensational Color that has a list of sayings that include colour, along with their meanings.
Exploring the site further - there are a ton of fun little tidbits including the reasoning behind a barber poles red and white stripes. It turns out in medieval times, your barber would also perform surgery including bloodletting....now you know :-)