I would store in this pocket of mine a trinket. No ordinary trinket though. As I'm a warlock I would have manipulated it in some way to enable it to open into a small hologram of my family, wife, children. That's assuming if I had any children. Or.. I would create out of pieces of Vex a small robotic bird that can fold into a small cube allowing me to play with it when I don't feel like murdering.