I LOVE white hydrangeas.  I love all hydrangeas, truthfully, but white ones are so versatile, soft and welcoming.  Using them or another fluffy flower like peonies, rather than a  a more delicate flower like white orchids or roses, will lend the black elements on the table some softness that keeps it from being too stark and Sixties mod.  It’s such a harsh color scheme that I would further soften it by adding wide black ribbons to the vases with big bows and long trailing ends.  Rather than a black or white tablecloth, which would make the table too light or too dark, black napkins draped over the side of the table as placemats would add the black element without overwhelming the entire table, and white plates over them would balance the darkness.  For accent colors, I’d like some gold – perhaps a few burnished gold candlesticks with white taper candles on the table – and a little greenery either in the vases or place cards.  I LOVE these simple pear place cards.  So fall-y and simple, and absolutely gorgeous.