Halloween Discussion Forums, Costumes, Horror!

We are having our 2nd annual Halloween party this year.
The theme is Killer/Victim. You can dress up as a killer or a victim and it's opened to anything from (killer) Jason and Freddy to a mafia member or hunter and (victim) Camp Crystal lake victim, vampire victim to an animal whose had a run in with the hunter...

My question is what would be a good costume?
I can't think of a thing and it's our party, the costumes mentioned above are either being used or considered.

I hate not having something picked out but am just drawing a blank.
It doesn't have to be bloody but it works too.

Thanks!

For the killer, how about the plant from Little Shop of Horrors? For the victim, a big, clear-ish, blood splattered body bag like Tina from the original Nightmare on Elm Street.

Wow! Love this idea. We are having our second annual Halloween costume this year and think I may just have to steal this idea. Its getting down to the wire because I feel like some people have already planned out their costumes. At any rate, I may just do it with my close friends. Great theme.