Create a visually striking blank poster for a marketing campaign featuring a vibrant cosmic background filled with twinkling stars and sparkling celestial elements. The top section should have a soft gradient that transitions from a deep blue to a rich purple, while the bottom half features a subtle, shimmering gold texture. Leave ample empty space in the center for adding text or logo later. Include decorative elements like glowing comets and sparkling particles that draw the eye toward the center, enhancing the overall marketing theme and creating a sense of excitement and possibility.

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Create a visually striking blank poster for a marketing campaign featuring a vibrant cosmic background filled with twinkling stars and sparkling celestial elements. The top section should have a soft gradient that transitions from a deep blue to a rich purple, while the bottom half features a subtle, shimmering gold texture. Leave ample empty space in the center for adding text or logo later. Include decorative elements like glowing comets and sparkling particles that draw the eye toward the center, enhancing the overall marketing theme and creating a sense of excitement and possibility.