Well, this one is pretty easy to figure out. Instead of scooping out all the pumpkin 'guts', I cut out the mouth, nose and eyes and left the interior intact, to give it a little bit of a gross out factor.
I made the eyes large enough for little hands to fit in and dig around. The nose and mouth are much smaller.
You can see in the pictures that all the seeds and strings are still hanging around. I didn't cut out the cap, either.
I put a Dollar Tree LED candle inside, which gives it a spooky, wavering glow.