For what it's worth, it was (mostly) blue in '92:
More here: http://tinypic.com/useralbum.php?ua=CDgaYJp8mF%2Fm0YMdtQMt%2FA%3D%3D
Not sure if that link works, I've never linked a TinyPic album before. If it does work, you have to sort it from "Oldest to newest".
However, this shot (right before Luke turns off his saber) is a bit more greenish.