Create a serene and beachy atmosphere in your kitchen with a coastal blue theme. Paint the walls in a soft blue shade reminiscent of the ocean waves. Add white cabinets and countertops to create a clean and fresh look. Incorporate seashell accents by displaying a collection of seashells on open shelves or using seashell-shaped drawer pulls. Complete the ambiance with coastal-inspired accessories like a driftwood centerpiece or a nautical-themed rug.