The natural combination of navy and white is a favourite for a reason; it recalls Hamptons elegance and the fresh feel of the seaside.
But navy is a natural partner to many other hues too: orange, red, mustard yellow, and pale blue are all both enhanced by, and flatter, navy.
The key here is in getting the proportions right; choose your dominant shade, which here is white, with navy used as the secondary hue, and finally accents of mustard.
Using colours in equal proportions makes a scheme look riotous, so choose your hero tones before you begin.