I’d like to see a noise trap you can make with a can, some string and some pebbles or something. I like the idea of sheet metal over the windows, wooden barricades seem pretty weak.
This probably belongs in the terrible ideas thread, but what if items on their ground hampered movement speed based on their volume? Maybe some kinda hidden trait that could cause people to trip/slip like with marbles and such. Perhaps extend that to liquids sitting on the ground(TT walking dead anyone?) Though I could see people getting a little annoyed having to play janitor all the time.