First off NancyR Thankyou for putting together your reference links very helpful for noobs to hybrids/rba's like me; well done! Hopefully I'll get an iHybrid in the coming days. To the guys with the Illuminati SE's man those things are sharp looking.
Last note to the people talking about the color of the 12/21/12 SE's I can understand green as it is the color of Jade... not sure if that is where the color came from just where my thinking led me.
Fisty mentioned a while back that it is green because green/blue from the Mayan culture represented the transitions of life and death. Hence the choice color for the end of the world.