Truth be told Jim, they didn't make much sense to begin with.
Anyway, back to the subject at hand. I must admit, I've always liked the war ensign of the Kaiserliche Marine, the whole eagle and black cross on white, really rather stylish.

Lower Saxony has a nice flag too, reminds me a lot of the emblem of the county of Kent in the UK, 'Invicta' it's called (which is quite ironic considering whenever England has been invaded in the past, it's nearly always Kent which cops it first...so I'm not so sure when 'unconquered' comes from because it sure isn't history...).
Out of the original German states though...it's got to be Prussia every time.
EDIT: Also you missed post #73.