The core

Snowflake photo: The core (1600 x 1200)

Prints available at Artist website (mirrors at Pixels and FineArtAmerica), RedBubble.com.
Licenses for commercial use - at Shutterstock.com, 500px.com.

This medium size snowflake (3-4 millimeters from tip to tip) is one of my favorites. It is very clear and symmetrical. I like how volumetric surface distorts background behind the crystal. Big hexagonal center contains very simple, but interesting inner pattern.

8 identical RAW photos was taken as quick series and averaged to boost signal-to-noise ratio of this picture. Background: dark woolen fabric, diffused light of grey cloudy sky, external optics Helios 44M-5, January 2013, Moscow.

This photo was chosen by Autodesk to be a part of Fake or photo? challenge version 6. This is interesting and, IMHO, not so easy challenge. My result is only 67%. If you would like to try it, you already know one right answer. :)

Also, i used precise mask for this version with blurred background:

Snowflake photo: The core, blurred version (1200 x 1200)

Prints available at Artist website (mirrors at Pixels and FineArtAmerica), RedBubble.com.
Licenses for commercial use - at Shutterstock.com, 500px.com.

This snowflake available as ultra HD wallpaper:

Next winter i captured similar snow crystal: Icy jewel, with slightly bigger size and more complex patterns:

If you want to see more snowflakes, you can browse through all snowflake pictures.
And here is article about snowflake macro photography.