Create a conceptual mood board depicting colors: bath green, black, brown, and beige. The mood board should include unique representations of each color. For 'bath green', visual elements could include green colored water, green tinted bath products, or a seaside shot under green lighting. For 'black', elements might include a night sky, black onyx gemstones, or dark silk cloth. Brown could be represented by elements like chestnut trees, aged wooden furniture or a desert landscape at sunset. Beige could be embodied in a sand beach or baked goods, such as cookies or a baguette.