Clyde kindly posted the link to the pattern for Ruth Perry's Celtic Snowflake the other day. Being a glutton for punishment (I've only tried Celtic tatting once), I gave it a try. Beautiful. Ruth's instructions are clear as a bell and the only problem I had was joining in the wrong place a few times. I had a lot of fun with it.
The smaller snowflake was tatted in Lady Shuttlemaker's "Icicle", size 80, and the larger one is tatted with Yarnplayer's "Snowflake", size 20.