Thanks Max... One more thought. Jesus is the chief-cornerstone of the Church and the cornerstone is the first foundational piece laid for a new building or cathedral.. If you look at cornerstones of Cathedrals, maybe you can do something subtle of the architectural elements on your lower green shape.. Maybe you can borrow the shape of the base of St. Veronica Statue which has great meaning; has to be subtle though..
http://www.sacred-destinations.com/italy/rome-st-peters-basilica/photos/eosa_076p