In a coastal two-tone kitchen, adding an island with a waterfall marble countertop can create a serene and beachy vibe. The upper cabinets can be painted in a light and airy color, such as seafoam green or sky blue, while the lower cabinets can be a contrasting shade, such as white or light gray. The waterfall marble countertop adds a touch of elegance and refinement to the space. The combination of the coastal elements and the smooth surface of the marble creates a visually interesting and harmonious design. This type of kitchen design is perfect for those who appreciate the relaxed and breezy atmosphere of coastal aesthetics but also want to incorporate a touch of luxury. The island with a waterfall marble countertop becomes a focal point that brings together the different design elements and adds a sense of sophistication to the kitchen.