It looks great. I like your idea of a grouping. We don't have anything over the bed for that same reason (earthquakes) I started a quilt to hang over my bed about 6 years ago. It has been waiting 6 years for me to quilt it!!!! Maybe I will finish it and add a couple of smaller ones to hang with it.
Of course we have large bookcases on either side of the bed, full of books. We only have earthquake straps on the tallest one. If we have a bad earthquake, I will be hit with a bookcase full of books!!!