An amazing selection of snowflake macro photos and a article showing how to photograph snowflakes can be found on Alexey Kljatov’s ChaoticMind blog
If you have an SLR you can reverse your lens on the body using a reverse adaptor, or reverse a lens on a lens using a coupling ring (which has filter threads on both sides), or use extension tubes, close up lenses, macro lens or bellows. We have all these available on PhotographyAttic. If you cant find what you want contact us with specific requests