This is a great thing to do with any pearl necklaces that have come unstrung. My grandmother gave me quite a few in a bag, for me to fix. Or something. I chose the something.
For this you’ll need a bunch of different sized & coloured pearls (real or fake, I don’t care), some jewellery pins, 6mm jump rings, translucent fishing twine, and ~3cm wide satin ribbon. Tool-wise you’ll need needle-nose pliers, wire cutters, and clear nail polish.