I've never made them before BUT it looks like pieces of wood with 2 holes drilled in the side. Then it looks like they placed small pictures on the wood and then shellacked them. I would guess that they used a stretchy elastic type string to put them together ... very simple pattern of wood, bead, wood, bead etc then tie and wear.
I like the fact that you could imitate the christian pics or replace with family pics, pet pics, travel pics ... it is endless really!
What a great idea for a gift ... hmmmmmmmmm ... I think I am going to see if I can try to find those wood pieces!