Baten Kaitos : Eternal Wings and The Lost Ocean.

Chrono Cross + GC graphics = Win

All the backgrounds are pre-rendered, but they're so active and detailed it's feels like it's much more, leaves and flags blow in the wind, water trickles softly in a stream.

Heck, once you get up close to seeing the character and monsters you can see how detailed they are too, not in realistic details, it's not trying to be realistic it just looks...good.