The blue Lotus flower has been steeped in symbolism since the time of the Egyptians, where it was used as a metaphor for re-birth and of the Sun. It also plays a key role in Buddhism where it’s colour is thought to be associated with a victory of the spirit.
"A blue lotus symbolizes the spirit’s control over one’s physical senses or compulsions–mind over matter–which heightens one’s spirituality by overcoming temptations of the flesh. The blue lotus represents knowledge, wisdom, and intelligence. In art, the blue lotus is always shown as partially open, the center never showing, as a means of symbolizing that the growth of mind and spirit over body is never truly finished. "