Now, my brother has had me watching YouTube clips called How It Should Have Ended. Basically, they're animated shorts that take various movies and show us how it should have ended. They've done a lot, including Twilight, Lord of the Rings, Avatar, Captain America, Thor, The Dark Knight, etc, etc.
The other day I saw this - How Harry Potter Should Have Ended. I think it's hilarious, which is mostly the point, and not entiely feasible, but it's worth the laughs.
It's at least given me part of the ending I wanted!
If you enjoy this, definitely check out their other videos. I especially like their superhero versions, like Superman, The Dark Knight, Thor, Iron Man, & Captain America. Not all of them make much sense to me...as in I don't see much of a difference to the ending...but my brother tells me I'm simply overthinking it, as usual! Mostly I just love the parts where Superman, Batman, & co. chat in the diner! Worth a watch for that alone I think.