Summer is the easiest season to chase with color, and Pool Blue is where this one starts — that clean, lit-from-within turquoise you see in the shallow end at noon. It carries the whole scheme, fresh and watery without tipping into baby blue.
Against it, Sun Coral is the warm flush of skin after a long afternoon outside, and Citrus Zest is the squeeze of lemon on top — just enough to make everything feel alive. I keep both in small, deliberate doses so they spark rather than shout. Crisp White is the towel-and-tile backdrop that lets the brights breathe, warm enough to feel sunlit rather than clinical.
To stop a palette this lively from floating away, I drop in Deep Marine as the anchor — the deep-water blue at the far end of the pool. A little goes a long way on a door, a frame, or a band of trim, and it gives the brighter colors something solid to push against. Lead with the blue, keep the warm colors as accents, and the whole scheme stays summer-bright without ever feeling like a poster.