abstract
armor
armoring
armour
backdrop
background
battleship
blank
copyspace
design
dirty
frame
gray
grunge
hard
heavy
industrial
industry
iron
ironclad
metal
metallic
military
old
pattern
plate
porthole
rivet
rivets
rust
rusty
screw
sheet
ship
stain
steam punk
steel
submarine
template
texture
textured
two
wall
window