Plantlife

Best stuff I found this year was a 100-foot roll of el-cheapo black plastic table cloth. Here, I used spray adhesive to glue pine needles, leaves, and such to it, and hide what would normally be the front door. This was a somewhat last-minute move, but it worked out pretty well.

 

Next to it is a fake metal door to a "security office", where trick or treaters would get their candy. This was done so I could see down the 'cave'.

Done