Ad agency TBWA Berlin was creating an Advent calendar Facebook App for McCafé. Each day you could open a new window and find a digital present.
No custom tailored presents were available. If two users opened a door on the same day they'd find exactly the same media inside.
I came up with the idea to provide each user a custom snowflake. Each user that opened one specific door received a custom snowflake that no other user had. It was generated by a script I wrote in Processing. The shape variations and colors were endless: