I know the meaning behind Twilight's cover,but did Stephenie say what the other covers meant?And if not,what are your guesses?

well you already know twilight's (the forbidden fruit tastes the sweetest)
but heres some stuff about the others:
she didnt have a say with New Moons cover so it has no meaning
Eclipse is a torn ribbon so it represents Bella being torn between Edward and Jacob
Breaking Dawn represents Bella changing from a human (red chess piece) to a vampire (white chess piece)

maybe u can think about th new moon cover as if bella was the flower and she keeps on falling further down because she misses edward