Create a vibrant and eye-catching marketing poster background for a sale event. The design should feature dynamic geometric shapes in bold colors such as red, yellow, and blue, creating a sense of excitement and urgency. Include a subtle gradient overlay to add depth, and incorporate playful patterns like polka dots or stripes. Place space for promotional text at the center, with a slightly blurred effect in the background to draw attention to the message. Add small icons or illustrations of shopping bags, price tags, and discount symbols scattered throughout to enhance the sale theme.

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Create a vibrant and eye-catching marketing poster background for a sale event. The design should feature dynamic geometric shapes in bold colors such as red, yellow, and blue, creating a sense of excitement and urgency. Include a subtle gradient overlay to add depth, and incorporate playful patterns like polka dots or stripes. Place space for promotional text at the center, with a slightly blurred effect in the background to draw attention to the message. Add small icons or illustrations of shopping bags, price tags, and discount symbols scattered throughout to enhance the sale theme.