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You can turn the finial to any shape you find pleasing. Unfortunately, none of the photos I took of the turning of this one were usable due to camera operator error so the photos of the finished piece will have to suffice. I decided to turn a miniature Christmas tree as the centerpiece for this one. The "trunk" of the tree was turned at 1/4" diameter and long enough that there will still be some exposed when the end is bottomed out in the hole in the finial.
Photo #23: Christmas tree centerpiece
The only difference in turning the ornament body was to bore a 3/8" diameter hole up through the bottom into the cavity.
Photo #24: Finial mounting hole bored in ornament body
Once finished and assembled the ornament looked like this:

Photo #25: Finished ornament