[mmahemoff]

The post mentions Gravatar, so actually it should do the same thing and return a generated image as a function of the domain, if no known one exists.

[michaelmior]

It might be nice if that were an option, but having that as the default behaviour would be strange and unexpected IMO.

[david-given]

That's exactly what I thought. I told it to generate Google's logo and was then quite surprised when it actually produced Google's logo.

[alexhawdon]

That would be an interesting extension to develop. I agree it should be optional.

I'm envisaging scraping colours and fonts from the target domain to recreate a text-only logo.

[mmahemoff]

You could also use the first letter of the domain as the basis of the logo. (I do something a bit like that on faviconist.com)