A few links to throw your way:
Ivan Langton's (@misterel) excellent post on playing with openbadges on moodle on Karl Goddards test site (@MrKarlGoddard) - http://misterel72.blogspot.co.uk/2013/04/moodleopenbadges.html#!/2013/04/moodleopenbadges.html
My (@gideonwilliams) rubbish attempts to use the free Totara test site (http://openbadgestotara.elearning.catalyst.net.nz/) to create, earn and display (via Mozilla backpack) a soccer badge using a Cloze Quiz (with conditional activities) - http://www.scoop.it/t/moodle-and-mahara go to Making an Openbadge in Moodle Videos parts 1-6 (5min screenr videos)
Hope they are of use?