I made little cardboard angels that open up to reveal a chocolate inside when you take the top off. They are based on the ‘exploding’ boxes on this excellent site, which will generate templates for making all sorts of boxes and shapes, including a set of the Platonic solids, stars with any specified number of points, and so on. A grateful hat-tip goes to Suse, from whose Facebook post I discovered this handy resource. Happy New Year!