The jewel tones and cascading abundance of these arrangements are an ode to autumn. Set in gleaming containers, extra-big black and crimson grapes give a nod to that ubiquitous Thanksgiving motif: the cornucopia.

For the centerpiece at left, drape leaves (we used dogwood) over the edge of a bowl, followed by bunches of grapes. (If guests might nibble on the grapes, make sure the leaves are clean and nontoxic.) At mealtime, gather family and friends around this "cup" that runneth over.