Fun! Suggestions!
For a scene creator this was pretty entertaining. There are plenty of reasons what this is good, but I'm going to skip that and go right to what I think will help it.
1) Make an option that will let the swords and other objects fall on a lower layer, so it can give the appearance of either being impales in a body, or the wall. (or a head impaled into the wall)
2) Sword scratch marks, without the blood. For details on the wall.
3) Larger blood stains, and a puddle of blood as well.
4) Zombie hands. (just kidding)
5) Bullet shell casings.
6) Smoke!
Anyway, thats all I can think of at the moment. There is an endless amount of crap you could fill the screen with, but its better without being over complex.