Neil Kamimura, noted Slayer fan and winner of History Channel's Forged in Fire competition, has done the most Slayer thing ever with guitar strings. Kamimura acquired the strings used by Gary Holt on Slayer's final tour, smelted 'em down, and made 'em into a knife.
You can watch the entire process below, which of course is accompanied by a live version of Slayer performing "Raining Blood".