There's a Flickr group just for Green Bikes, and I happily contribute with photos like this Green Scwinn Racer I spotted at my local bike shop.
A few days after seeing this almost pristine Schwinn Racer, I saw another green Schwinn on the road in Santa Cruz. This one is a little more used.
When Lynskey introduced their first steel bicycle in 2008, it was in a delighful green Irish themed paint job.
Have a wonderful St. Patrick's Day, all.