abstract
aged
art
artistic
backdrop
background
bolt
brown
conservative
corrosion
decay
design
dirty
grunge
grungy
industrial
industry
iron
material
metal
metallic
nut
old
oldage
patina
pattern
power
rough
rust
rusty
rustycolored
rustyeaten
scratch
screw
solid
steel
strong
surface
texture
textured
time
vintage
worn