Here are all the patterns that have already been suggested in the comment area:
These are two of them, I love making these!
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I have a fave Snowflake pattern somewhere...I made a ton one year.
I got bored with my Baktus, so I decided to do some snowflakes. These (Michaels) are really easy. I made one with Vanna's Glamour, a white yarn with a silver thread running through it. Here's a shot from my phone, and it is not blocked or anything. I'd like to stiffen it. What is your favorite way to stiffen snowflakes?