We have had fun making Sugar Sculls. We made one each. They are made just like the joined heart baskets, each side made from two layers. We refrained from metallic paper, glitter glue and rhinestones, but that is definitely an option.
The individual chain parts are made from two identical pieces. Making them is easiest if you start by aligning the two pieces turning them so that the small cuts do NOT overlap. Then fix with glue a three points, but NOT within the short overlap. In that way the chain part may open, be attached (to the scull or the chain) and then closed with glue.