I don't have any in-process pictures of this tutorial, because it was pretty easy and we were on a roll when we did it, but it's easy enough to figure out, so hopefully you will not miss them.
First cut some 8.5x11 paper into 3/4" to 1" strips. Then fold them in half. Then curl the ends inward. Hot-glue fishing line in between the curls at varying distances. I kept our line curly, and it was pretty cute. If you don't like it curly or if the hearts' bottoms stick out too far for your tastes, you can punch a hole through and string them onto the line. Place them where you want them before you glue.
TaDa! That easy.
I had a bunch of extra paper, so I decided to surprise my favorite kid and decorate above her door with the heart chains.
And then I decided I liked them spread out better...