In a failed attempt to create a copy of a famous Danish building brick, I decided to give it a twist - and voila! A fun set of earrings!
(Or you could say "Screw it!" - so I did)
Update: Added better support for the knobs and fixed a possibly broken STL file.
Print at fine resolution, use a sharp object to clean it up. I have printed it with a Replicator 2 at 0.1 mm resolution, 100% infill and 1 shell. Each ear ring took about 45 minutes to print.