aged
alloy
aluminium
aluminum
art
background
banner
black
board
border
construction
design
diamond
dirty
floor
frame
gray
grey
grid
grunge
grungy
hard
heavy
industrial
industry
iron
ironworks
line
material
metal
metallic
old
panel
pattern
plate
rough
rusty
shape
sheet
silver
space
stainless
steel
surface
template
texture
textured
tough
wall
wallpaper