MC Escher's famous lizard tessellation made into a puzzle with a storage box.
Print as many puzzle pieces as you wish, in as many colors as you wish. I have 27 printed and they all fit in the box nicely with room to spare.
Lid is a multicolor object in two parts.
3/26/20 Update: Originally, the incorrect lid file was uploaded; this has been fixed. The correct files are now uploaded. The lid fits snugly and cleanly, if it is too tight feel free to rescale the Z down to 99% for a looser fit.
The author hasn't provided the model origin yet.