Here are some openSCAD Easter eggs experiments. The Easter eggs are made by joining two threaded hemispheres together with a half inch long hollow screw. One hemisphere is flattened to represent the big end of an egg; the other hemisphere is stretched. There is space inside the egg for a small gift. Simply decorated versions are included. A version where the hemispheres are permanently connected is also included. It can be decorated by changing the color of the filament while printing. A "little" one piece version fits inside the larger versions. See the openSCAD code.

The screw threads were constructed with "threads.scad" which is available at http://dkprojects.net/openscad-threads/