abstract
alloy
aluminum
architecture
background
banner
bar
black
board
border
cold
construction
copy space
cross
design
dirty
frame
gray
grunge
hard
industrial
industry
iron
ironworks
material
metal
metallic
nail
old
panel
pattern
plate
polished
rectangle
rough
rust
rusty
shabby
sheet
shine
shiny
silver
space
steel
tablet
tack
template
texture
textured
wall