abstract
aluminum
backdrop
background
blotch
chrome
construction
corrugated
dirt
dirty
fence
galvanized
gray
grunge
industrial
industry
iron
lines
macule
material
metal
metallic
old
panel
pattern
ripple
roof
rough
row
rust
rusted
rusty
scratched
seamless
sheet
silver
stainless
steel
striped
surface
texture
tiling
tin
wall
wallpaper
white