An illuminable accessory device for use with a vessel. A pliable, generally cylindrical sidewall can slidingly receive and hold a bottom portion of a vessel. The received vessel bottom portion is slidingly removable from the sidewall. An electrically powered light source surrounded by the sidewall lies beneath the received vessel bottom portion. The light source is enclosed in a light disk through at least a portion of which light from the light source is transmissible. The light disk supports the received vessel. This accessory device can produce various lighting effects, e.g., in a liquid held in a bottle, cup or other container.