All you need is a glass jar, some borax, a pipe cleaner, hot water & a pencil.
The first step is to take your pipecleaner and twist it in to a snowflake (or any other shape you desire) and attach them to a pencil that you will balance over the top of the jar and keep it from falling in.
The second step is to put 3 T of borax in the bottom of a glass jar. Then add 1 cup of boiling water to the jar and stir until the borax is completely dissolved. If desired you could tint the mixture with some food coloring, but I don't find that necessary if you have colored pipe cleaners.
You final step is to insert your pipe cleaner sculpture and let it sit for 24-48 hours. You should start to see crystals forming after a few hours.