Black/olive drab lanyard/fob with a white skull bead on a keychain. 

Spyderco Dragonfly with a black/olive drab paracord lanyard and a white skull bead. 

Flat and twist keychain lanyards with skull beads. 

Spyderco Navigator with maroon paracord/white polycord lanyard and antique silver finish peruvian bead. 

Mini lanyard in olive drab/orange with a glow-in-the-dark bead on my Leatherman Micra.