My daughter's gir lscout troop will be coming over for a tech night, and I wanted to find something quick and easy for the girls to make on a 3d printer - I found a very easy Cookie Cutter Designer by guru http://www.local-guru.net/blog/pages/cookiecutter-editor, which he also posted on Thingiverse http://www.thingiverse.com/thing:3433. The program is very easy to learn and use and makes very usable cookie cutters in a short period of time.
Guru has kindly provided source code and compiled versions for MacOS, Windows and Linux - go to http://www.local-guru.net/blog/pages/cookiecutter-editor and download the correct version for your computer. I used the Windows version.
Custom Cookie Cutter Generator software
Optional image to trace
3d printer or 3d printing service
Sugar cookie dough, gingerbread dough or your favorite roll-out cookie dough recipe.
If you want to print these cookie cutters, you can find the STL files at thingiverse, http://www.thingiverse.com/thing:22614
Step 1: Open Custom Cookie Cutter Generator
You can move the dots with your Left mouse button (LMB).
'+' button will add points, but you can't select exactly where the dots will be inserted. Dots will be added in at half-spaces. I find it best to add lots of dots at the very start and then slide them around the perimeter as needed. More dots make a smoother outline and a nicer cookiecutter.
'-' subtracts points
't' loads a file for tracing
In this example I loaded an internet image of the Dr. Who Adipose (fatty tissue) creature from the "Partners in Crime" episode.