Manage contact lists with folders

The new design is mostly working well. But I really need a place to put lists that are no longer active, but still need to be maintained for reference. Our organization markets internally to our members. We have two main seasons, fall and spring. The membership shifts slightly each season, as some members take a break and others join or rejoin. I want the current season lists to be visible, but need to know which past seasons included a particular member. I want to be able to display, under "Email Lists," organizing folders as we can in the "Emails" module. That way I can have the most current, active lists visible and available; the other lists are archival and can be referred to without cluttering the interface. Thanks!