Don’t even try to model something like snowflake! 🙂 At the beginning I tried to figure out how to make model of snowflake, but then I found Incendia , fractal engine made by Ramiro Perez (Aexion). He provides Snowflake fractal generator for donors, donating for his effort, but for free You can get base software for generating interesting and random fractal models, which You can then export as .obj or .stl formats. I was happy to donate some in this special Christmas time and make decent renders of snowflakes quite fast. Snowflake generator is really interesting stuff and interesting to watch how random fractal crystals of flake are growing.
Merry Christmas & Happy New Year!