Make pumpkins three days in advance. Prepare crisped rice cereal treat mixture following recipe directions. Shape into approximately 10 balls, 2 in. to 3 in. dia. Use cone tool to indent top.
Tint 36 oz. fondant orange. Use 20 in. fondant roller with gold guide rings to roll out fondant 3/16 in. thick. Wrap fondant around balls to cover; use damp brush to attach bottom edges together. Use dowel rod to mark divisions from top to bottom. Reserve remaining orange fondant for pumpkin topper.
Tint 10 oz. fondant green (reserve 7 oz. for curly vines, pumpkin topper and stem and curls.) Knead in 1/2 teaspoon of Gum-Tex into 3 oz. of green fondant. Divide into 3/4 in. balls and roll into logs, 1 1/2 in. long. Use the veining tool from set to imprint side of stem. Twist into stem shapes. Use damp brush to attach stems to pumpkins. Let dry 24 hours.
Use brush to brush on shading with brown and orange Color Dust.