Add new image suggestions

[ford442]

Added 5 distinct, high-quality image suggestions (Italian Futurism Bioluminescent Reef, Ashcan School Beehive, Bismuth Fireworks, Brass Orbital Ring, Graphene Volcanic Eruption) to public/image_suggestions.md, strictly following the required markdown template and appending them to the "Prompt examples" section.

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PR created automatically by Jules for task 8929471856494619336 started by @ford442

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