Ask HN: Ideas for getting a visual to represent a domain other than favicon?

I'm building a chart of top domains submitted to Windy Citizen and would like to spice it up with a visual for each domain on the chart. The chart is automated, so any images need to be grabbable programmatically. I could pull in Favicons, but was wondering if there was a way to get something a little more visually compelling. Almost every domain has a twitter account where they post their stories. It'd be great if there was some way to programmatically grab a twitter avatar for a domain. Is there a service that lets a publisher link a twitter account to their site in the header? If not, perhaps there should be. Other ideas?