abandon
architecture
backdrop
background
boundary
build
close
construction
dirty
enclose
entrance
exterior
factory
fence
fortify
gray
grunge
guard
hard
heavy
industrial
industry
iron
line
metal
metallic
note
old
panel
paper
pattern
plate
protect
rust
rusty
scaffold
sheet
site
steel
striped
template
texture
textured
vintage
wall
weathered
white
zinc