Abstract: Provided is a kit, device and method for decorating fingernails and toenails with an illuminating light. The kit includes a power source, a power source case, at least one light to be positioned on a fingernail or toenail, an adhesive for connecting the light and the power source case to the fingernail or toenail; a conductive ink for electrically connecting the power source to the light; and a conductive ink application device for applying the conductive ink directly to the fingernail or toenail to electrically connect the power source to the lights. The device generally includes a power source, a light and an electrical circuit positioned on the top surface of a fingernail or toenail whereas the method generally includes steps for applying these components onto the surface of a fingernail or toenail.