Roll a ball or orange fondant
Use a teaspoon to make some groovy grooves around the sides
Indent the top with your fingertip
Roll out 3 thin green sausages and twist them a bit
Roll a small green cone and flatten the wide end
Fix all the green bits on to the top of your pumpkin (refer to image) with a bit of water, edible glue or powdered egg white solution
​Poke in some evil eyes and a nose with the end of your paintbrush and fill with a small amount of black fondant
Indent some evil frown lines - then turn it around because its too scary to look at arrrrgh!