abstract
aluminum
backdrop
background
black
clip art
construction
cover
design element
display
equipment
filter
gray
grid
high tech
illustration
industrial
industry
iron
macro
mechanical
mechanical back
metal
metal surface
metallic
nickel
pattern
perforated
perforation
plate
protection
punched
repeat
repetition row
repetitive
sheet
signboard form
stainless
steel
strong
structure
table
technology
template
texture
textured
tile
titanium
wallpaper