While not really a shape, this seemed like the best place to "house" these cool pressed glass beads. They really glow in the dark. Exposure to light makes them really glow! Sold by the bead. The image below shows the beads first in the dark, then in dim light then finally in daylight. Cool!
What makes the beads glow? There is an element that reacts to ultra-violet light that is baked into the glass. It absorbs the light and then glows when viewed in the dark. Its totally safe, no health hazards.