The Lotos flower is associated with purity and rebirth in many cultures as it emerges from a murky pond.
At night it sinks underwater and at dawn it rises and opens again.
The roots of a lotus are in the mud, the stem grows up through the water, and the heavily scented flower lies pristinely above the water, basking in the sunlight. This pattern of growth signifies the progress of the soul from the primeval mud of materialism, through the waters of experience, and into the bright sunshine of enlightenment.
THE COLOR OF THE LOTUS HAS AN IMPORTANT BEARING ON THE SYMBOLOGY ASSOCIATED WITH IT:
White Lotus : spiritual perfection and total mental purity.
Pink Lotus: : This the supreme lotus, generally reserved for the highest deity. Thus naturally it is associated with the Great Buddha himself.
Red Lotus : It is the lotus of love, compassion, passion and all other qualities of the heart.
Blue Lotus : This is a symbol of the victory of the spirit over the senses, and signifies the wisdom of knowledge.
More info from a cool article: http://www.jendhamuni.com/news/articles/lotusFlower.htm
Beautiful Slow motion Lotus flower blooming: