Indoors

Fake blood
Use food colouring to make fake blood
Blood on the floor, wall, everywhere
Close-up, medium shot

Handprints
Bloody handprints on the wall, the mirror, and so on.
Can also appear outdoors, like an  empty bus or tram station with bloody handprints on the schedule board.

Hand
A close shot of a shaking hand on the floor.
Hands patting the door or window.

Dirty dishes
Dirty dishes placed in the sink, the water dripping from the tap.

Outdoors

Zombie walking
Wide shot of people walking like a zombie on the ground.
A high angle shot from the rooftop.
There should be no people and cars passing by.

Street
Still shot of a quiet and dark street or a messy street filled with rubbish.

Legs
A close shot of someone’s leg dragging on the ground.
I will try both still shot and tracing shot. I think still shot is difficult to achieve the effect, but tracking shot is very hard as well according to my former experience of tracking shot.  

Fallen trolley
A close or medium still shot of a fallen trolley on the ground.