It sounds like the green is the overall choice. But I wouldn't do that at all. The OBW is traditionally sewn together so that there is no other fabric between the hexis. I've done a couple and I sew the hexi halfs together in rows to accomplish the 'no other fabric' affect. There's not a lot of contrast throughout your blocks so having the usual flow of color wouldn't work for your fabric choice.
It's going to be a wonderful quilt no matter what you decide.