Leaning on the Everlasting Arms
Totally disagree with Thrice's "Anthology" being a better closer. Lyrically, it's perfect for the final stretch of the album, but so is "Disarmed," and that song has a much more final feel to it. Besides, while "Anthology" is a great resolution to "Promises," "Disarmed" resolves the bulk of the album. As for musically, again, "Anthology" is definitely final stretch material, but the final seconds/minutes would feel weird as the final seconds/minutes of the album. "Disarmed" winds everything down better. (All in my opinion, of course.)
As for closers I can think of:
U2 - "Where the Streets Have No Name"
It's easy to call this a great opener because it's a great song and opens a great album, but I think it sounds so much more like a closing track. It builds slowly for one last release, like a victory lap, and then winds down beautifully. The lyrics certainly don't hurt my case. If nothing else, it's be a great penultimate track leading into "Mothers of the Disappeared," with "I Still Haven't Found What I'm Looking For" as the new opener.
Taylor Swift - "The Best Day"
I love "Change," but it doesn't belong on Fearless. Seriously. Just chop it off and use it as a b-side. "The Best Day" resolves the album's themes just perfectly.