Snowflakes

Snow flakes are the patterns formed by snow crystals. They always form hexagonal symmetry
This means that if we rotate the object 1/6th of a whole turn as if it was a wheel, we would end up with a new orientation, which would look identical to the original

There are infinite shapes and they have endless variations, but the symmetry deep within each little speck is the same.
For more details log on to
http://highhopes.com/snowflakes.html
There are 3- D snowflakes .
you can create those as model.
http://www.montessoriworld.org/Handwork/foldingp/snowflak.html