Create a stylish and vibrant billboard design that features a blank central space for advertisements. Incorporate bold and colorful geometric patterns around the edges, with eye-catching gradients transitioning from bright yellows to deep blues. Include playful, abstract shapes and dynamic lines that convey energy and creativity, set against a backdrop of a clear blue sky. The overall composition should be modern and visually striking, suitable for attracting attention in an urban environment.

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Create a stylish and vibrant billboard design that features a blank central space for advertisements. Incorporate bold and colorful geometric patterns around the edges, with eye-catching gradients transitioning from bright yellows to deep blues. Include playful, abstract shapes and dynamic lines that convey energy and creativity, set against a backdrop of a clear blue sky. The overall composition should be modern and visually striking, suitable for attracting attention in an urban environment.