Pick a round platter, board or plate about 10 to 12 inches across (a black one makes the colors pop). Cut the cheddar, bell pepper and cantaloupe into bite-size pieces about the same size as the tomatoes, then pat the cantaloupe and tomatoes dry with paper towel.

Build the pumpkin: scatter the cheddar, bell pepper, cantaloupe and tomatoes over the whole plate, either mixed at random or in small clusters, packing them in snugly right to the edge.

Make the face: press the black olives into the orange layer as triangle eyes and a nose, and line up the blackberries in a jagged row for the mouth. Nudge the orange pieces around them so the face stays in place.

Serve right away with toothpicks on the side. To make ahead, cover the orange layer and chill for up to 4 hours, then add the olives and blackberries just before serving.