abstract
aging process
alloy
aluminum
backdrop
backgrounds
brushed
business
business backgrounds
closeup
copper
damaged
dark
design
design element
dirty
factory
gray
grunge
heavy
heavy industry
industry
iron metal
manufacturing
material
metal
metallic
modern rock
no people
old
oldfashioned
pattern
plate
rough
rust
rustic
rusty
scratched
scratching
sheet
shiny
simplicity
stained
steel
textured
textured effect
unhygienic
wall building feature
weathered