Begin by carving a large ten-inch slate-blue Jarrahdale pumpkin with a serrated knife, scooping out the center and inserting a water-filled plastic container with soaked floral foam. Build an asymmetric floral arrangement using deep copper spray chrysanthemums, rust-colored toffee roses, goldenrod, and trailing copper beech leaves, allowing the florals to spill out dramatically over one side of the blue pumpkin. Place the carved blue pumpkin on a charcoal or deep navy linen runner. Surround the central vessel with two smaller, uncarved blue flat pumpkins and three warm orange heirloom squash to establish a balanced contrast of shapes and tones. Arrange hammered copper charger plates and amber cut-glass wine glasses at each place setting. Distribute six copper metal taper holders with dusty blue or caramel-toned taper candles throughout the arrangement, lighting the tapers just before guests sit down.