Cut graham crackers in half, making squares. In a microwave, melt white candy coating; stir until smooth. Dip one pretzel in candy coating; let excess drip off.
Place on a graham cracker square. If desired, fill pretzel holes with candy coating. Decorate with orange sugar or sprinkles. For stem, dip the back of one gumdrop piece into candy coating; place above the pumpkin. Repeat. Let stand until set, about 30 minutes.