Made a little example for u... Nothing special, just 20 minutes work... Added a broken shelf with some boxes, borken wall, hole one the ground with some plates and some cables.
Try to do this too and add dirt & crack decals / broken furniture / brick stones on the broken wall...

regars Sebastian

[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains