So - I admit it. I really get a kick out of those notifications that say that I've earned a new badge.
What about a category of badges for ideas that are logged by a given user? In my mind, this is one of the more important contributions that a community member can make (providing real feedback from the field about what is working and what is not working) but doesn't have a badge for this category of contribution.
We may need to design this carefully so that we don't end up with dozens of the same ideas, or loads of ideas that are not relevant - a possible way of doing this may be rewarding the ideas that get a certain number of stars or where the product team confirm it's not a duplicate and move it to a review status?