Dave's Paper Snowflake Patterns to get you started.
I have a special Christmas carol to share with you, sung by the Pentatonix. This a capella group won "The Sing Off" a year or so ago. I loved them and continue to appreciate their music -- all voice, no instruments. Pentatonix has a new Christmas album out called PTXmas. I just downloaded it via mp3 this morning and I love it. Enjoy!