All you need is orange yarn, brown or green yarn for the stem, flour, water, balloon and a bowl to help keep the balloon in one spot. Mix 1/2 cup flour to 1 cup water until it creates a paste. Blow your balloons up to the size you would like your pumpkins. Cut the orange yarn into long pieces and dip them in the paste. Wipe off the excess and place the yarn on the balloon.
Once you are happy with the amount of yarn on each of your balloons, use your brown or green yarn and make a stem.
Let them dry overnight. You will want to flip the balloons over at some point so that the yarn that was in bowl has a chance to dry too. When they are completely dry, pop the balloons and pull out the balloon pieces.