The one thing I would say is that variety through inclusion of community and topic representation would be important. But not such variety that it destroys the general established design. Design being the uniting feature and the topic being the individualized. So if you could have a design that is flexible enough to tell a story of a part of the community while still maintaining that its visually understood that each part is a part of the whole, you have a winner. Even better if it didnt require you to recreate everything from scratch every time you want to point to a specific community inside hive.