These are spider ring bling. We did these at a Halloween party the other day. The idea came from the beadyeyedbrat Halloween pages online. First painted with acrylic paint, and then sprinkled or dipped in glitter. (A spritz of sealer after the paint dries will keep down "glitter dust".) Jewels, sequins, beads were added with a tacky glue dot ~ (it helps to have a tweezer and a steady hand for the smallest ones).
These are some big spiders that came in the plastic assortment; they're about 3-4 inches from tip to tip though they look smaller in this picture than the rings. Tiny dots of color and decoration can be added with a 3D paint like Scribbles. One could also apply the baubles with one of those fancy tools that heat already-applied adhesive on the back of the jewels. Could also use glitter glue, and I might try a bit of gold-leafing today!