As a kid, on cold winter days I would sometimes take a wet paper towel and wipe it on a glass pane door to make a thin film of water. If the temperature was too cold it would quickly freeze up in an uninteresting glaze. But if it was just right it would freeze slowly and form beatiful intricate designs quite like what you got on your bin there. It was very neat to watch in real time -- the leading points of frost branching out and also curling like ferns.
I imagine it has something to do with the crystal structure when confined to a surface, and given time to grow. It is very interesting.