Create your own pumpkins...why not? Big, little, round, oblong, tall, short or medium...do your own thing. It looks as though there's a typo in the supplies...a 1/4" strip of paper is really, really small for paper mache...you can use a strip up to 2" provided your creation isn't itty bitty.
A couple of tips found in the Comments: crepe paper strips rather than torn paper strips (now that's thinking!); wall paper paste as the adhesive for the strips. If you plan to paint the pumpkins (most likely), acrylic paint will act as a sealer. Watered-down white glue (Elmers, Ross, etc.) also is a sealer; the glue can be tinted with paint, liquid water colors or reinkers.
Click TUTORIAL/TEMPLATES (above) and start your very own pumpkin patch.