This cost me a total of around $3. I'm not big into the 'harness' jewelry, but I'd seen necklaces like this before and wanted one! It was pretty easy, and looks great. Goes with almost anything, too.
Take the 30 inches of thick chain, and cut it in half (my pliers have little clippers in them). Then on the end of each, attach the toggle clasp or whatever kind of clasp you are using with jump rings.
Cut 7 inches of the thin chain, and use jump rings to attach it to the bottom rings on the other ends of the the thick chains. If you were to wear it, it would look like the picture, or as if it was all just one chain.
Count up 5 rings from the bottom rings, and attach another 7 inches of thin chain to them.
Repeat as many times as you want. I liked mine with ten rows on it, but you can use however many you like. Just keep counting up 5 rings, attaching, and repeat.
(in the picture, mine is already finished))
Easy, cute, finished! That girl on etsy wanted $50 for it... crazy. Enjoy :)