Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4687220.
Why not having some math fun while baking for christmas :) It's actually possible to create your own cookie cutters with 3D-printing! So I tried to recreate the Penrose tiling, which is an aperiodic tiling of a plane (there is no translational symmetry). It's quite easy to start with, because the tiling is just based on two different rhombuses with equal side lengths. Only the angles are different (1. 36°/144°/36°/144° and 2. 72°/108°/72°/108°). The basic shapes are simply drawn in Rhino and a GH-Script adds the final geometry (thickness, fillets, etc.). Other shapes could use the same script.
To emphasize the pattern I did them in different flavours (the dark ones are cocoa) and put the tiling together. Saves space too :)
Disclaimer: Please note that most printing materials and printing processes are not considered foodsave. Depending on the plastic type you also shouldn't put the cutters into your dishwasher.