man, that's bloody awesome.
I still get shivers of both excitment and fear down my spine when I read Blackest Night. It is possibly one of the best conceived and well executed "sagas" in the last decade of comics. Not to mention that the symbols for each of the corps being instant icons in and of themselves (and destined to remain iconic for many decades to come).
I agree that the black and white symbols should not be there on the same arm, it'd be overkill. Perhaps the black and white ones could be on the other arm thus creating the same symmetry as the concept (ie: black existed before the emotional spectrum and that the 7 colours come together to make white light).
Now you just have to wait till Fatbot sees this and I'm sure he'll try to top that.
*tip of the hat*