Add a step between "no gravatar account" and "default gravatar sent back", using Google Images Search Service + 2 bonus usage

Alexandre Gaboriau

woncercode

wondercode

Generate Images (AI) – Magic Post Thumbnail

Get images for your posts with automatic generation & multiple banks. Generate as featured images or in your content with Gutenberg Block and in bulk

Art Project Group

APG Google Image Sitemap Feed

Genera dinámicamente el archivo sitemap-image.xml, un mapa de sitio de imágenes para Google. No requiere ningún tipo de configuración.

aguimaraes

GIMB Google Image Media Button

This plugin adds a new media button that can insert images directly from Google Images.

Julio Potier

This plugin takes place between the gravatar picture and the default avatar return. If an email is not associated with a gravatar account, a Google Image request is sent to grab the first best relevant face picture of this member.
When a google image photo have been chosen, the user will receive a mail with 3 links, 1st to delete this avatar if not relevant enought, 2nd to refresh it, if its email is not associated with a gratavar account, 3rd an invitation to create a gravatar account.
Also, you can add you own avatar by uploading your picture, easily !
Then, you can use a gravatar cache to keep all avatar files on your server and, limit the HTTP request on gravatar.com
Here comes a (french, just watch ;p) demo video, 15mn length. (video = version 1.8 !) 
http://www.youtube.com/watch?v=90mBwyNd5zU

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