In Greek mythology, Zeus wanted his illegitimate son Hercules, to become a god. In order to do this he needed to put his wife Hera to sleep so that Hercules could suck at her breast. Hercules did this so aggressively that the milk overflowed. Some milk went to heaven and became the Milky Way and some went to earth and became the white lily. The lily became a symbol for motherhood to the Greeks and to Christians they are a symbol of chastity and innocence.
Orange lilies however, are supposed to be a symbol of happiness love and warmth.
I found this next wax crayon drawing of orange lilies in a local charity shop and paid less than £1 for it. There are no clues as to who the artist might be or when it was drawn. It has kept its vibrancy really well.