Reserve 1 disk of dough for making leaf decorations. On a lightly floured work surface, roll out remaining disks into 14-inch rounds. Fit rounds into two 10-inch pie plates; trim edges, leaving 1/2-inch overhangs. Fold edges under, and press to seal. Freeze until firm, about 15 minutes.

Roll out reserved disk to a 1/8-inch thickness. Transfer to a baking sheet, and freeze until firm, about 15 minutes. Using a small (about 1 inch) leaf-shape cookie cutter or a paring knife, cut leaves from dough. Freeze until cold, about 15 minutes.

Brush edges of pie shells with a damp pastry brush; arrange leaves around edges, pressing to adhere. Whisk 1 egg and cream in a small bowl. Brush leaves with egg wash. Cut 2 large circles of parchment; fit into pie shells, extending above edges. Fill with pie weights or dried beans.

Bake pie shells 15 minutes. Remove weights and parchment; bake until golden brown, 15 to 20 minutes more. Cool completely on wire racks.

If using fresh pumpkin, discard seeds. Scoop out flesh, using a large spoon, into a food processor. Process until smooth, about 1 minute. Measure out 3 cups, and transfer pumpkin to a large bowl (reserve any remaining for another use; if using canned pumpkin, add that to the bowl instead). Add brown sugar, cornstarch, salt, cinnamon, ginger, vanilla, nutmeg, remaining 6 eggs, and evaporated milk; whisk until combined.