"paracord over an existing strap" - oh, that is cool. It's a cobra weave based around a strap. Very slick.
The Cobra Weave Exploding Stick Bomb is pretty dang cool. I've seen a lot of the smaller stick bombs on Instructables but none of these chain ones so I'm really.
Cobra Weave Exploding Stick Bomb: 7 Steps (with Pictures)
#Paracord for Beginners: 5 Easy Variations on the Cobra Weave
DIY Cobra Weave Key Fob DIY Weaving DIY Crafts could be zipper pull for pencil cases