For the indieweb enthusiasts, http://webvatar.com/ http://webvatar.com/ is Gravatar for websites, and you don't need to set up anything, just put the link there

For the indieweb enthusiasts, http://webvatar.com/ http://webvatar.com/ is Gravatar for websites, and you don't need to set up anything, just put the link there and it will fetch and cache the image from the referrer website. There are not much people marking their websites with microformats, but this can be a minor problem.