This reminds me of "The Church of Wittertainment", a feature on Mayo & Kermode's (Radio) Film Programme, which initially was given a "Clergy Corner". That generated in response an "Atheists Alcove" and every new subdivision has given it a new feature (I suggested a "Pedant's Portico"). Apparently an architect has actually drawn up plans that incorporate all the named features and promises to add any additional Annexes, Corners or Outhouses as required.
Okay, so now I am really curious how you will add those two corners without some additional dimensions! ;-)
Here three ideas about some returning subjects if you have some room for additional corners:
The shout-out corner - Also known as the plug corner. Who needs to be known by everyone apart from the funky overlords, tree-guy, Chuck Tingler, etc. Also there might be some money in this. ;-)
The food corner - everyone does it, but what are the secrets of tasty food? What is the best convenience food? Worst topping for pavement pizza?
Both are universal so everyone could say something in that corner about it. Or here probably something more funny:
The Funk-Junk corner: Take a person mentioned in the latest word funk and either a crime from Ausins Law corner or an action from the latest dice funk. Paint a wordpicture how this person would react in the Tingle-verse.
But I just don't know what you WANT to talk about, so that are just some ideas for you to play with ...