I saw this on pinterest too. I used wire then covered it with coffee stained cheesecloth.
And added a cheesecloth bow and rusty heart.
Tiny clothes pins hold the photos.
I first measured about 4 1/2 inches and put in the nails. Used some wire I had, wound it around the nails to make little washlines! Then wrapped them with the cheesecloth.
I hot glued some pieces of cheesecloth over the nails so it won't scratch the wall.