This is the classic jack-o-lantern with tea light holder, modified from:
http://www.thingiverse.com/thing:167043
http://www.thingiverse.com/thing:172135

I have also included an "uncarved" 123D file with the face template.
To make your own face, just draw your design on the plane in front of the pumpkin. Then extrude so the design intersects with the pumpkin body, and use the "subtract" tool to delete where the solids are overlapping.

I'm a big pumpkin fan obviously, so if you're looking for for some more pumpkin enthusiasm, I also made a "halloween pumpkin" video inspired by the christmas fireplace - https://youtu.be/tzflcFuh-B0