Design a vibrant and stylish billboard featuring a sleek, modern design. The billboard should have a bright, eye-catching background with a gradient of bold colors like electric blue, neon pink, and sunny yellow. Incorporate abstract geometric patterns and flowing lines to create movement and energy. Leave the center area blank for customizable text or imagery, ensuring it stands out against the colorful backdrop. Add subtle shadows and highlights to give depth, making the overall appearance dynamic and engaging.

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Design a vibrant and stylish billboard featuring a sleek, modern design. The billboard should have a bright, eye-catching background with a gradient of bold colors like electric blue, neon pink, and sunny yellow. Incorporate abstract geometric patterns and flowing lines to create movement and energy. Leave the center area blank for customizable text or imagery, ensuring it stands out against the colorful backdrop. Add subtle shadows and highlights to give depth, making the overall appearance dynamic and engaging.