Structures and Advice for General Administration Documents

Dear Forum, 

Within nearly every organization there are departments or business units that have "General" Administration Document needs.

These could be anything from infrequently used templates, to notes on staff planning, budget notes and other reference materials. 

I want to avoid creating a document class for each department specifically for admin, and I want to avoid creating a General Document class called "Admin" because of the potential that it becomes a huge dumping ground for anything that a person considers admin.

Do you have any recommendations or advice? I know this is partly a training and education topic also! I just haven't found a clean and easy way to give staff this flexibility. Additionally, they are also used to freely creating structures and folders in the network. 

Many thanks!