This guy worked out how to scratch-build (punny!) functionally retractable Wolverine costume claws. Warning, you will need a bandsaw and some skill with aluminum, but anybody who has done any fair amount of auto body repair should be able to whip up a SNIKT-o-riffic pair of faux-adamantium pigstickers with relative ease. Instructions to be found here.
Jay Garmon has a vast and terrifying knowledge of all things obscure, obtuse, and irrelevant. One day, he hopes to write science fiction, but for now he'll settle for something stranger -- amusing and abusing IT pros. Read his full profile. You can also follow him on his personal blog.