GUIJARROS, THE FAMILY LIGHT. Guijarros is a family of three pebble-like lights, each one perfect for use on a wall or ceiling. Designed by Mariví Calvo, the Guijarro lamps were inspired by fine shingle: small, smooth and rounded pebbles whose individual shapes have been carved over many years by water and sand. A tiny wonder of nature, every pebble exhibits its own colour, contours and form.