Awesome organisation project and repurpose project: cardboard tube (wine bottle holder, or even a paper towel tube) with push pins or C-hooks to store necklaces. This is a space-saver too! I would suggest weighting it with something like marbles or sand
Rock Photo Holders - (using floral craft wire) Tightly loop one end of the wire around a stone; then wrap the wire around itself to secure. Stand the remaining length of wire upright, twisting the top inch or so into a flattened spiral circle (as shown).