The classic & Scoubi-Doggle (aka Scoubidou, Boondoggle, gimp, lanyard, and rexlace). Handmade from two thin plastic strings.

How to start the Quad/Tornado stitch lanyard (including pictures) - YouTube

Make a beaded lanyard look like jewelry with these illustrated step by step lanyard instructions. You'll make a lanyard to carry your ID badge in style!

Lanyard Crafts for Kids : Patterns, Directions, Instructions, and Knot Tying Arts and Crafts Ideas for Children to make Lanyards with Lessons and Tutorials