Auron's theme maybe. or just the first few measures.

there's a song by this guy named steven cravis called kalaidescope. they use that on that bubblebee game at whatever that site is. It isn't from ff but I wouldn't mind having it play constantly

Or Lulu's theme. Anything that I've put in a separate playlist to repeat for three days perhaps. (like terra's theme. that has five whole files in a special playlist@.@; because I dont want to deal with looking for them all again.)

maybe TBM's version of The Decisive Battle (ff6)

But what I really would like to have looping constantly would be the kid radd themesong (kidradd.com) I mean, for a game that doesnt' actually exist, it's AWESOME.
(barring that, one last choice would be Pirates Ahoy!)