With the two seasons secured (and with it a huge safety net allowing them to take risks), I'd like to suggest the AWESOMEST THING EVER: A Weird Al episode.
Can't you see Puck pulling off an incredible version of "One More Minute" as he tells off Rachel (or Quinn, or whoever's dumping him at the time)? Maybe he could even mash it up with "I Was Only Kidding."
Now that Artie's shown his rap chops, how about a version of "White and Nerdy" from him? If the actor who plays Jacob Ben Israel can sing, he should join in, of course.
Emma was born to sing "Germs/".
The group's "proper" (as in, on the stage, not integrated into a plotline) performance could be, "That Boy Could Dance," or "Eat it." Or "Nature Trail to Hell," it they really want to make me happy.
And Brittany could finally get her solo shot on "I Want a New Duck." Because you know that she does.
I'm not kidding. They have to do this. And soon.