I have been using XFN for a while now, and I was trying to figure out how to make it more transparent to the average user. So I decided to make some icons that can be appended to links to signify XFN relationships. Here are some of them:
You can see them scattered all over the webpage on various links. If you like any of them, feel free to use them. All the icons are under Creative Commons Attribute-NonCommercial-ShareAlike 2.5 license.