abstract
alloy
aluminum
art
background
banner
bar
board
border
brown
brushed
chrome
construction
design
diamond
frame
gray
grunge
hard
heavy
industrial
industry
iron
label
material
metal
metallic
old
pattern
plate
retro
rivet
rough
rust
rusty
scratched
screws
sheet
silver
steel
surface
template
texture
textured
train
vintage
wall