Badges seem to be the new hot ticket in many classrooms today, but I have to say I'm not really comfortable with implementing what is essentially a points-based reward system. I'm not convinced that these kinds of extrinsic rewards pay-off with long term behaviour change, and I think the novelty wears off for children at a certain point.
I envision an 'Explorer badge' for people who go on safari and bring back interesting files, links, and resources to the group. If I'm a bit cagey in the way I put this together they should have to cross topics to complete their badge. I hope this will accommodate those who want to create a new file, experiment with different features of their boards, become more expert at something, explore other resources and add to our collection, and so forth.