There is a certain snowflake in Frozen that appears more often than others. I forget who it was that worked on Frozen that said it, but they said whenever you see that snowflake its not nature, its Elsa. Its used as Elsa’s ‘mark’. Its in the opening title in Frozen, its what Elsa builds her palace on, its on Elsa’s palace doors, and its what Elsa’s chandelier looks like from the bottom, even in promotional material. If you look closely you can see it often.
Also:
HOLY. She has her own signature snowflake. YES!!!!!!!!!!!
she didn’t just kill her sister, she left her signature mark on her too.