First, I made a friendship bracelet. I love the chevron pattern, but feel free to choose any one you want. I used this tutorial video, and it is super easy once you get going. Also, if you are a perfectionist, (like me) don't freak out if one of your knots turn out bad....you can always put the charm there to cover it up!
Second, take the charms off of your necklaces. You may need to take the part that attaches to the clasp off. Save the chains in case you want to use them in a later project! Remember to keep the jump rings that are attached to the charms!