Once the pumpkin cools, add the blended walnuts and biscuits to it. Add the sugar, butter, cinnamon and knead well.
Leave it in the fridge to harden. Then make small balls and use a toothpick to form lines imitating those of a pumpkin.
Use the green fondant to form the pumpkins' handles. Place them in paper cups and put them in the fridge.
If the pumpkin itself isn't orange enough, you can add orange artificial coloring to the treats.