I can do what you need, with the picture in the BG, and you SHOULD be able to change the Opacity of the boxes.
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Edit-
Okay, FINISHED ! (Didn't Take long)
In Window_MenuStatus, Underneath:
self.contents = Bitmap.new(width - 32, height - 32)
Add this:
self.opacity = 150
@picture = Sprite.new
@picture.bitmap = RPG::Cache.picture("MENU_BG")
And then add:
Underneath
self.contents = Bitmap.new(width - 32, height - 32)
In all the Windows (If you wan't it in all the windows, Lol.)
Also, you'll need a picture in your Game/Graphics/Pictures folder called: MENU_BG
And here's my Info. Cards demo with this implimented:
http://www.box.net/shared/uygtf3gton
Tell me what you think and if it works okay, Afterall, I'm only a noob scripter,
Jbrist.