Generate a mood board that encapsulates the concept of a 'Dog Park'. This board should include various aspects such as lush green trees, wide open spaces for dogs to run and play, different breeds of dogs like Golden Retrievers, Beagles, Bulldogs, and Poodles joyfully interacting with each other, owners observing their pets, dog-friendly equipment like benches and drinking fountains designed specifically for dogs. Colors should gravitate towards natural tones, with plenty of greens, blues, and earth tones. Not to forget, a sunny clear sky providing a pleasant backdrop.