abstract
alloy
aluminum
backdrop
background
banner
black
board
border
construction
dark
design
dirty
durable
frame
gray
grey
grid
grunge
hard
industrial
industry
iron
material
metal
metallic
modern
old
panel
pattern
plate
reflection
rough
rust
sheet
shiny
silver
space
stainless
steel
surface
template
texture
textured
wall
wallpaper