abstract
aged
alloy
aluminum
ancient
antique
aperture
background
black
chrome
construction
dark
dirty
grate
grille
grunge
grungy
hole
industrial
industry
iron
ironworks
material
metal
metallic
old
orange
panel
pattern
perforate
plaque
plate
red
repetition
retro
rough
rusty
scratched
screen
seamless
solid
stained
steel
surface
texture
textured
wall
wallpaper
weathered
yellow