Design a stylish billboard set against a bustling urban backdrop, featuring a blank central space waiting for a brand or message. The billboard should have a modern, sleek design with vibrant colors, incorporating eye-catching geometric shapes and patterns that evoke energy and creativity. Surround the billboard with bright city lights, green trees, and a diverse crowd of people engaging in various activities, highlighting the dynamic atmosphere of the city. The sky should be a deep blue at dusk, with hints of sunset colors reflecting off nearby buildings.

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Design a stylish billboard set against a bustling urban backdrop, featuring a blank central space waiting for a brand or message. The billboard should have a modern, sleek design with vibrant colors, incorporating eye-catching geometric shapes and patterns that evoke energy and creativity. Surround the billboard with bright city lights, green trees, and a diverse crowd of people engaging in various activities, highlighting the dynamic atmosphere of the city. The sky should be a deep blue at dusk, with hints of sunset colors reflecting off nearby buildings.