Inspired by Eggcellence! See also:
This design, like Thunderegg 2, unscrews to reveal an egg-shaped storage space inside. Thanks to shura2000 for his delightfully whimsical "Yelow Submarine" keychain design, Muzz64 for the screw-together egg, to Art Davis for the original idea that started this whole egg-shaped ball rolling.
The version shown is about 2 inches long, suitable for hiding one bite-size chocolate egg.
Support was challenging to remove at this size, but doable. Print larger with support enabled for best results. Paint as you please. In Pepperland, anything goes!
Photo 2 shows the sub with International Rescue in hot pursuit... (http://www.thingiverse.com/make:141229 and http://www.thingiverse.com/thing:1395981)