Create a diverse and dynamic collage capturing the essence of the 'Western' theme. In one segment, showcase an empty desert landscape with towering cacti under a blazing sun. In another, depict a solemn cowboy, of Hispanic descent, riding a majestic horse towards the setting sun, with his hat lowered to shield his eyes. Another part should be filled with a bustling saloon scene with patrons of various descents and genders. Include historical elements like a steam engine train crossing a wooden bridge and an old 'Wanted' poster fluttering in the wind. Remember to incorporate elements like cowboy boots, lassos, and prairie plants to enhance the 'Western' vibe.