Various embodiments relate to beverage accessory devices for use within beverage receptacles. In one exemplary embodiment, a beverage accessory device generally includes a housing having sidewalls defining a cavity therein. A substantially fluid-tight container is within the cavity of the housing. The container includes sidewalls defining a chamber. At least one of the container's sidewalls is spaced apart from at least one of the housing's sidewalls such that a portion of the housing's cavity remains separating the at least one container sidewall from the at least one housing sidewall. At least one electric light source is substantially entirely within the container's chamber. The chamber can also be configured for receiving at least one power source. The at least one electric light source is operable for illuminating at least a portion of a liquid within the beverage receptacle when the beverage accessory device is within the beverage receptacle.