I created a Java servlet to create PNG images of Identi.ca users. You can use this utility on your website or gmail signature. The servlet looks up the user via the Identi.ca API. It uses the user's preferred background and foreground colors. The PNG image includes the user's name, avatar, latest notice and notice date.
The URL is: http://identicamap.com/utils/UserImageServlet?q=userNameGoesHere.
Here are a few examples: