First, arrange the caps in a pleeeasing way. I chose a triangle with 2 caps on either end, so it wasn't to big.
Number the caps and put dots where you will need to poke holes. Don't use sharpie! It won't come off.
Now poke holes where the dots are.
Now begin the process of tying all the caps together. Line up the holes, cut some thread and tie them. Do this over and over until you have the shape you want.
Now get a long piece of thread, about half as long as you want the necklace to be, and tie one end to the end cap, and the other to one half of the clasp.
Repeat for the other end.
Wear it proudly!