This is an "ice flake" inside a ball for the 3D Printed Ornament Challenge. It is made using two pieces (which I printed in different colors).
When the "ball with hole" is 60% complete (print without supports), pause the printer (call for "load filament" on MakerBot machines) and insert the flake as low as possible.
Turn the flake around and insert the shaft through the hole at the top of the ball. There is just enough room to rotate the flake without extra clearance.
On the top of the flake's shaft there is a hole for the ornament hook. The ball can be rotated to provide whatever view of the flake is desired.