This is just a picture but it would be really easy to make with a cheap plastic charger plate and lots of glitter. Just make sure to spray with a clear coat to keep the glitter on the plate and off the table.
The final (yeah, right!) edit of the centerpieces I made for our Civil Union reception in June. Live Bonsai tree, miniature Zen garden with a small Buddha figure, glass bowl centerpieces with Beta fish on a bamboo mat.