There are several ways to carve a pumpkin into a feeder.  One of the easiest ways is to cut a small to medium-sized pumpkin (3- to 5-pounds) in half.  Scoop out the soft stuff, leaving a shell about 1/2 inch think.   Make perches by making small holes and inserting twigs.  Use 2 loops of twine to make a basket hanger for the feeder, or purchase a hanger from a local arts and crafts store.  Allow the insides to dry before adding sunflower seed.  

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Another approach for hanging is to stick two dowel rods through the pumpkin from opposite sides, then tie the twine to the dowel rods.
  Search Google for "pumpkin bird feeder" to see many creative designs.