Give some model suggestions

[iPeez]

Spiky fence
Mines
Destroyed buildings
Planks
Destroyed cars
Trap holes
Spears in the ground
Netting

Cant come up with more Guess most is said allready

 

[ShadowBlade]

How about dead bodies? There might be casualties of the zombie attack...
And how about this (http://www.thehelper.net/forums/showthread.php?t=67207) dangling down from a telegraph pole?