The Martha Stewart Show, October 2006
1. Use ruler to measure the halfway point on each pumpkin, and draw a horizontal line around circumferences with grease pencil. Cut pumpkins in half; discard tops. Lightly scrape insides clean. Tape templates to pumpkins (starting at the backs, since templates won't meet up exactly). Poke holes with awl along outline of the patterns; continue around pumpkins, moving template as you go
2.Use keyhole saw to cut out shapes along dotted lines and tubing to cut tiny holes.
3. Place larger pumpkin on top of inverted smaller one. Use a 2-inch wood screw to fasten pumpkins to each other. Insert glass bowl, and fill with water and dry ice. Note: Wear gloves when handling dry ice; use in well-ventilated areas.
Templates (enlarge as needed)
A short length of square brass tubing (bent in on the flat sides to form a 4-pointed star)