abstract
alloy
aluminum
backdrop
background
blank
board
border
check
construction
design
frame
gray
grid
grunge
hard
hole
industrial
industry
iron
material
mesh
metal
metallic
modern
net
old
page
panel
pattern
plate
round
shape
sheet
shine
sign
silver
space
square
steel
surface
technology
template
texture
tile
vivid
wall
wood