Lotus flower.

Why do lotus flowers have anything to do with Buddhism?

That is because of Buddhist iconography, in which Buddha is often represented on a pink lotus. In Buddhist symbolism, the lotus represents purity of the body, speech, and mind as if floating above the muddy waters of attachment and desire. It is also to be noted that most Buddhist, Chinese, Hindu, Japanese, amongst other Asian deities are often are depicted as seated on a lotus flower. According to legend, Gautama Buddha was born with the ability to walk and everywhere he stepped, lotus flowers bloomed.