I just wrote a WordPress Plugin, that allows you to display the Foss.in badge on your WordPress based website.
If you just want a easy setup, then you can just use the sidebar widget that is available when you install the Plugin. If you want more control over the display, then you can the template function yourself. Details about the template function is available in the Plugin’s homepage.
BTW, did I tell you that I am going to be speaking at foss.in? Yes, my proposal got selected and I will be talking about building robots using Open hardware like Arduino.