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A clean 2x2 grid layout of four distinct mermaidcore aesthetic iPhone wallpaper designs, each panel a different underwater fantasy scene with consistent iridescent shimmery color palette, top-left panel showing sunlight filtering through turquoise ocean surface creating dancing caustic light patterns on a bed of pearlescent seashells and scattered gold coins, top-right panel showing an ethereal underwater portrait of flowing iridescent fabric caught in a gentle current surrounded by tiny silver air bubbles and bioluminescent plankton, bottom-left panel showing a coral garden with holographic and opalescent sea anemones in pastel pink, lilac, and aqua with shimmering light refracting through the water above, bottom-right panel showing a close-up of abalone shell texture with rainbow oil-slick iridescence and water droplets catching prismatic light, each panel rendered in dreamy soft-focus photography style with prominent light reflections, lens flares, and shimmery bokeh, thin white grid borders separating the four panels. Render in Mermaidcore aesthetic, iridescent and shimmery, soft-focus dreamy style.