In A Heavy Problem, we specified a goal for you, and the constraints that had to be kept in mind. Try taking a shot at defining the overall set of goals that the Heavy unlockables should be trying to achieve. Watch out for the common circular logic trap of finding an idea you like and then trying to extract goals from it. We find it's best to not think about ideas at all at this point, and to focus entirely on more abstract goals.
The way in which Valve are exposing this process to the public is just another example of how they value the community feedback, which is great in my opinion. Read the rest of the post over on their blog.
