have you seen the flower called bleeding heart? it's exactly that shape, usually pink in the heart area and white below.
the story goes that a certain catholic priest was feeling despondent because his congregation wasn't taking the communion seriously... it was just some bread and wine they had on sundays, you know? he was wishing one sunday that the bread would actually become jesus's flesh, to show his congregation the true meaning of what they were doing. well, this being the middle ages, god granted his wish. the goblet was suddenly full of blood, and the bread turned into a piece of heart muscle that constantly wept blood. it was a miracle. there's probably some holy relic somewhere.
the bleeding heart stands for the suffering of jesus, for sacrifice, for transcendent love. can also be interpreted as seeing spiritual concepts with your own eyes, for granting of impossible wishes.