http://daddu.net/10-flickr-groups-for-green-inspiration

“This is a really interesting idea. In support of World Community Arts Day, this group is dedicated to photos or artistic crafts that have been inspired by the green circle logo of the event. It led to some gorgeous abstract works, including photography, that you will be sure to enjoy. There is no limit on submissions, and the group has more than 1,400 photos – impressive, given how specific the niche is.”