aged
alternative
aluminium
aluminum
background
broken
construction
crushed
danger
design
dirty
dump
ecology
environment
factory
garbage
heap
industrial
industry
iron
junk
junkyard
material
metal
metallic
metalwork
old
pollution
recycle
recycling
rubbish
ruined
rust
rusty
scrap
scrap metal
scrapyard
sharp
stack
stainless
steel
structure
texture
trash
used
waste