These are cookie cutters.
My wife drew them on a napkin.
We share them under Creative Commons 3.0 Attribution Sharealike (CC-BY-SA). This means that you are free to do almost anything to and with the data except going commercial with it or reissue them under a different license.
The OpenSCAD files are based on mrbenbrittons excellent cookie cutter script for OpenSCAD which can be found on Thingiverse.
Way of production:
photograph drawing on paper
cut down image to work area
fix "holes" in the outline with paint brush tool
reduce to 1bit depth with appropriate threshold
import into new Inkscape drawing
convert bitmap to outlines
switch view mode to outlines
use path select tool to cut away outer or inner part of silhouette
export as OpenSCAD polygons with Inkscape OpenSCAD extension
create new file from mrbenbrittons cookie cutter
include polygon OpenSCAD file and scale to appropriate dimensions
render STL from OpenSCAD when satisfied
 mrbenbritton's cookie cutter script: http://www.thingiverse.com/thing:28882
 Inkscape OpenSCAD extension: https://github.com/martymcguire/inkscape-openscad-poly