One of my early projects using the MakerBot was to create cookie cutters. (I started with this Cookie Cutter Editor and eventually figured out how to create them using Inkscape and OpenSCAD, though I'm still not 100% happy with this method.)
I also made Pac Man Cookie Cutters. There's a blog post with more details here: Pac Man cookie cutters.
Shane ended up helping out with a BarCamp logo cookie cutter I was trying to make at the same time, and we both ended up learning about the MakerBot in the process.
There will probably be more cookie cutters showing up here, as they're (now) pretty easy (and fun) to make. If anyone wants to make one, let me know, and I'll show you how I do it.