abstract
alloy
aluminum
backdrop
background
black
board
circle
construction
dark
design
dirty
durable
format
framework
gray
grunge
hard
heavy
industrial
industry
iron
layout
line
macro
material
mesh
metal
metallic
old
page
panel
pattern
plate
rampart
rough
scratch
sheet
shine
shiny
silver
space
stainless
steel
strong
surface
texture
textured
wallpaper