Decide how many pumpkins to use and how to arrange them. Cut a hole in the top or the bottom of each pumpkin according to how you want to stack them, and scoop out the insides. With a grease pencil, draw doors and windows; cut out. (For more intricate openings, download our templates.) For shutters, cut the piece from the window with a square, ridged cookie cutter, then cut in half. Carve "louvers" on shutters by scoring horizontal lines across them with a linoleum cutter; make some lines crooked for a decrepit effect. To hang doors and shutters, push heads of straight pins into cut edges, and attach to pumpkin. Carve additional details onto pumpkin with a linoleum cutter.