I used the Ankle Sock pattern from I Can't Believe I'm Crocheting Socks. You can read my review of the book here. I used Mary Maxim Twinkle Toes yarn in the Merry Christmas colorway. The yarn is a bit scratchy thanks to the metallic strand, but my socks are still comfy. The pattern calls for a D hook, but I know in order to hit gauge that I need to use a C hook.
My socks are a bit loose, especially around the heel, but I'm very happy with them. :-)
My completed Christmas socks, from the right
My completed Christmas socks, from the left