Create a stylish marketing poster featuring a vibrant, abstract background with bold colors blending seamlessly together. The design should incorporate eye-catching geometric shapes and fluid lines to convey energy and creativity. Leave ample blank space in the center for customizable text, ensuring that the poster has a modern and professional look. Include subtle textures to enhance depth and visual interest without overwhelming the design, and consider adding a slim border around the edges for a polished finish.

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Create a stylish marketing poster featuring a vibrant, abstract background with bold colors blending seamlessly together. The design should incorporate eye-catching geometric shapes and fluid lines to convey energy and creativity. Leave ample blank space in the center for customizable text, ensuring that the poster has a modern and professional look. Include subtle textures to enhance depth and visual interest without overwhelming the design, and consider adding a slim border around the edges for a polished finish.