For a bright and airy coastal beach house theme, opt for a white kitchen. Paint the walls and cabinets in a crisp white color to create a clean canvas. Add coastal colors through accessories and accents, such as blue and green dishware, aqua-colored pendant lights, or a turquoise backsplash. Incorporate seashell accents by using seashell-shaped knobs on cabinets or displaying seashell art on the walls. Enhance the beachy vibe with natural elements like rattan bar stools or a driftwood dining table.