Abstract: An ornamental lighting device is provided with a flexibly-shapable light-flickering tube that can be bent into user-designed signs, such as marks, graphics, letters, and many various others, and displayed in a flickering manner. The ornamental lighting device includes an elongated transparent tube having a hollowed inside; a cable of insulated conductive wires including one common wire and a plurality of triggering wires; a plurality of bands of serially-connected lamps mounted in the hollowed inside of the elongated transparent tube, each band of lamps having one end electrically connected to the common wire and the other end connected to one of the triggering wires; and a controller connected to the cable, which is capable of applying a voltage alternately in a predetermined sequence to the triggering wires so as to light up the associated lamps in the lamp bands in the predetermined sequence.