alloy
aluminum
backdrop
background
blank
building
business
checker
construct
construction
copy
corrugated
decor
decoration
design
dirty
empty
floor
frame
grate
grey
grid
grunge
industrial
industry
iron
material
metal
metallic
old
panel
pattern
plate
red
rough
rust
rusty
safety
sheet
silver
slip
space
stained
stainless
steel
surface
texture
tile
wall
wallpaper