I'm thinking she should go ahead with her plan to strip and refinish the plaques. I'd do it in a natural wood finish (either light, medium or dark). I would then mount a hand on one, a pair of ears on another, and maybe a neck (with or without a manikin style head) on yet another turning them into 3D displays similar to taxidermy mountings. The protruding forms could be made of styrofoam, paper-mâché, clay, or other easily sculpted material and then covered in a black flocking giving them a velvety felt like finish. Plaques could then be hung on a wall or other vertical surface and rings could be displayed on the fingers of the hand, earrings could dangle from holes in the ears, and a necklace could be draped around the neck.
The remaining plaques could be topped with a raised black velvet pad and placed flat on a table or shelf (like a plate or tray) and Sayo's jewelry pieces could be laid on top. Or maybe...
Oh, Oh, Oh, my brain is racing away with me. Another option would be to affix a cork pad to front of the refinished plaques and a frame brace on the back. Pins could hole the jewelry in place and the plaques could be displayed angled slightly back on a table or shelf. Or she could prop them up on an angle for a more sophisticated look.
Enough of my ideas. If you enjoy transforming trash into treasure as much as I do, why don't you head over to the article on her blog, let your imagination run wild and leave your ideas in her comment section. I know she would appreciate your creative insights as she takes these ordinary plaques and turns them into an extraordinary display for her artwork.