Prompt code:
A nostalgic and vibrant retro T-shirt design inspired by 1950s posters. The main element is a stylized watermelon with a lightly faded color scheme, exuding a sense of summertime. Surrounding the watermelon are sun rays or waves, adding to the retro vibe. The text 'Cool & Refreshing – The Taste of Summer' is inscribed in a retro font, complementing the overall design. The background is transparent, allowing for easy and versatile T-shirt printing.
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