Tape the ends of the first strip together to form a circle. Tape the end of the second strip to the to the ends of the first to form a circle across the first. Do the same with the last two strips until it forms a pumpkin shape. Tape the top of the strips together to help the pumpkin keep it's shape.
Cut out a stem from green or brown paper. Fold the bottom of the stem, and tape it to the top of the pumpkin.
Cut out eyes and mouth from yellow paper. Attach to the front of the pumpkin to make a face of the Jack O'Lantern.