At our 2008 party, the buffet was set up as a body "Victor" and we ate right off of him. I made a papier mache serving tray first and this was 6' long by 3' wide and only 6" tall at the feet. I'll find a picture and post it here in a minute but this is what was on the buffet:
Ribs... nice and dark red
meat loaf lungs
an icky pasta salad with a raspberry vinaigrette for color
Italian Sausage and two baked onions... (have plenty so you can replenish as needed!)
sub sandwiches for arms
pomegranate for the spleen
Italian bread scooped out with a spinach dip inside the loaf for thighs
the scooped bread chunks for the shins
Lil' Smokies sausages for toes (again, have plenty to replenish!)
nearly burnt hot dogs for fingers
breads and cheese slices scattered as needed for fillers (hip area, shoulders, etc.)

I was going to make a head out of the brain mold and deviled eggs and so on but we found a severed head prop at a garage sale and it was VERY effective.

The heart mold idea was also nixed as we replaced it with a beating heart that looked very real also. Again, very effective!

Oooh.... don't use forks! When the guests complain tell them that no morgue has forks in their utensil drawers!! Also.... no ordinary plates either. We scoured all the resale shops for old pie and cake tins.... much more effective with the overall theme of the morgue.

We also built an embalming station for the drinks, too. The urine container was Mai Tai's and the blood was Vodka and Cranberry. Delicious!!