We made another piñata, using the same method, for my 6 year old. Just a bit bigger and a bit more sturdy (we wrapped three times round instead of two). We filled it incuding theese necklaces hoping each child would get one. We made them together a few days earlier.
This is how:
-We cut the shapes with biscuit or plasticine cutters from white self hardening modelling clay.
-We made a hole and decorated with dots and lines.
-the next day, when they were dry, we painted them with golden acrilic paint. I added a tiny bit of tempera to modify the golden paint and we had different tones of metallic.
-we put them on the strings (mostly me that part) and in the piñata!