NPT StoneScapes® Regular Pebbles TROPICS BLUE REGULAR 1/2 Tropics Blue Pool Finish .5 Parent Kit. StoneScapes Regular Tropics Blue creates a dark blue water color and is comprised of dark blue pigmented white Portland cement, black, gold and white natural quartz pebble aggregates and a specialty blend of colored quartz highlights and abalone shell. The beauty of this finish comes from the shade and color variations inherent in natural materials.