NPT StoneScapes® Mini Pebbles MIDNIGHT BLUE MINI #228 Midnight Blue Pool Finish Parent Kit. StoneScapes Mini Midnight Blue creates dark blue to dark blue/green water color depending on the depth of the pool and the pool surrounds and is comprised of midnight blue pigmented white Portland cement, black, gold and white quartz pebble aggregates and a specialty blend of colored quartz highlights. The beauty of this finish comes from the shade and color variations inherent in natural materials.