This Tiger Mask is scary both because it's a fearsome tiger and because of how easy it was to create the model. I took 50 photos of the original mask I bought at a costume shop, and uploaded them into Autodesk 123D Catch which generated the model for me. Easy, Breezy, Scary...
This was printed on a MakerBot Thing-O-Matic with StepStruder MK7 with .27mm layer height, 30% infill, and a raft with exterior support. Enjoy!