Only nine months ago, Google tested a feature to show a graphic behind the Google search box header, that was customized based on your query. So if you searched for [flowers], Google would show an image of flowers as the header for Google Search. Google ran into issues where it was showing some nudity or not PG-13 related images for some queries and halted the experiment. Well, now Google is testing it again - 9 months later....
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Google Search Tests Custom Designed Backgrounds Based On Query Again
seroundtable.com