Abstract: An illuminative sucker includes a decorative back portion formed on a back portion of a sucker cup portion adhered on a flat surface, a lamp selected from a light-emitting diode and an incandescent bulb fixed on a lamp socket secured to the back portion of the sucker cup portion for illuminating the decorative back portion for decorative display or warning purposes. A plurality of the illuminative suckers may be assembled to be a string adhered on a flat surface for wide-area decorative, display or warning purposes.