I wished I had gone to WebJunction instead of the McArthur Grant competition to find an overview of badges. Webjunction had a nice two article piece on badges. Pt 1 was an introduction and Pt. 2 was how to implement a badge program at your library:
Badging the Library: Ahniwa Ferrari / 21 February 2013
Given that I work in a special library, I’m not sure there’s much use for a badge for patrons. But we do train librarians and maybe there would be a call for badging them. What do you think?