Oh, and paper shuriken 0wn j00. (Two links in there.)
I haven't tried the 8-piece version from the second page yet, probably never will, and I'm not going to dare attempt making the one-piece shuriken from the first page. Way too complex for my poor origami skills. The two-piece one is more than enough. I've experimented with materials a bit: regular printer paper is pretty good (sturdy, sharp, and heavyweight), thin foil (the kind you use in the kitchen) kinda sucks (the only upside is that it's shiny), and printer paper inside thin foil is great. Best of both worlds - sturdy, sharp, heavyweight, and shiny. It's sharper than the paper version.
\o/
And after folding three of them (one paper, one foil, one paper-and-foil), I've got the hang of it. Start ph34ring my l33t n1nj4 skillz. ;)