My favorite so far has been the Midtown Cowl by Jenny Williams which can be made with one skein of any of my lace weight yarns, as I plan on making for myself. Or you can make the French Quarter Shawl, the Taverna Shawl or Delancey Scarf.
For a friend you might think of the Novel Sleeve by Kathy Zimmerman or Oak Barrel Socks by Sarah Fama with any sock yarn. There is also the Ashbury Mitts, Watercolor Beret, Chivalry Mitts, Friendship Socks, Flipper Mittens, Roisin, or the Jet Gloves. The list goes on and on what you can do with sock weight yarns, so grab your Christmas list and start knitting!