Tassels. first I thought this is Monkey's fist knot, but later surfing helped discover that it's actually or most probably a rounded Turk's head knot, more at: http://www.beadinggem.com/2011/01/how-to-make-paracord-balls.html
Make a necklace out of curtain tiebacks!!!!!!
Fabric Covered Roller Shades with Handmade Tassel
How to make a Fabric Covered Roller Shade with Handmade Tassel