I wanted a round bauble that wouldn't require any real assembly, would print without support and I could combine two prints to give me a mix of colours even though my printer only prints one :)
There is a slot for inserting an LED if you want to have it illuminated. otherwise, a string with a knot at the bottom will allow you to hang it. Update: I've added a hook.
two layers top and bottom
OpenSCAD file is included
The original is 100mm diameter, scale the whole thing to suit your needs, I've printed this at 50% and it came out just as well.