It features 'The Flower of Life' symbol that forms the game board. There is also Leonardo da Vinci's self-portrait & some of the 'Secret Symbols', used to score in the game.
(click for full-size image)
I also recently updated my post explaining the more esoteric aspects of the game design, including some photos of the game in its various incarnations:
The Monkey Buddha Archive:
Click the link below for some 'Flower of Life' wallpapers for mobile devices, that I also made: