Arisia Convention

Mmmmmm, I wouldn't go that route, actually. An actual Shuriken would be potentially too complex and thin to be useful. I would probably make one out of clay or sculpey, so it can be thicker and a better shape for soap and then make the mold off of that. There's a four point star and a curved four point star that are fairly common for shuriken (if not as pretty as the more elaborate five point stars) and that could be made fatter and thicker to make for better soap. :)