Teal marble with coral-orange wave trim and a turquoise pool, the most saturated of our ocean-themed 18s. It is the one we reach for first at pool parties, and the reason is unglamorous: the palette sits with the water instead of fighting it. A red or purple tower next to a blue pool is a decision somebody has to make; this one never needs defending. Two lanes, 39 × 20 ft, two 20A circuits on separate breakers, ages 5 and up.