Measure your dreads. Then cut a long piece of wool, four times as long as the dread. You don't want to run out while you're wrapping, unless you're going for a half-wrapped look.
Tie the piece of yarn to your dread at the top. Tuck the tail end down --- you'll cover it when you begin wrapping.
Wrap the yarn around the dread. Keep the yarn tight in your hand so you don't end up with any gaps that will crimp your style. Continue wrapping all the way down the dread. If you notice any gaps, push the yarn up to tighten the fit. Stop wrapping when you reach the end.
Tie a knot at the bottom. Then cut off any remaining tail, unless you like the rebel punk look of a hanging tail.
Add dread wraps to other locks. Switch up the color yarn you use, or keep it all one color. Just a few yarn wraps can have a dramatic, playful affect on your locks.
Measure how thick your dreads are so you can get a bead that will stay on without pinching your locks for a major ouch factor. Then select a bead that has a smooth interior and is large enough to fit over your dread. Make sure the bead's hole size will fit your lock.
If you get serious about beading, you can enlarge bead holes with a bead drill, but there's no need to invest in one when you're trying out the look.
Pinch the end of your dread to make it smaller. Pretend you're threading a needle. You want to get the hair through the eye of the bead. You can even wet it a bit to compress the fibers, just like you would with thread.
Stick the hair through the bead. Push the bead up. You should be able to move it up and down your lock without too much resistance, but the bead won't be so loose as to fall off. Push the bead up, then push it down till you find the right height that showcases your dread bling.
Add as many beads as you want. Choose different color, textures and materials. Dread beads can be wooden, metal, glass, clay or plastic.