This is a really fun model I designed to try and create a couple of elements that attach via jump rings.  The top attaches to the bottom, just run the jump ring through the designated holes on the bottom, but around the hollow circles.

The front of the bottom looks like paint splatter, and prints well.  Printing facing down provides a lovely finish.

This might be one of my favorite models to date, as it's using a couple of different methods to join the pieces.