abstract
antique
background
blank
board
branch
dark
deciduous
design
dirty
dust
element
environment
foliage
forest
format
foul
grubby
grunge
material
messy
nasty
natural
nature
old
panel
pattern
plank
plant
polluted
rough
stain
stripped
surface
texture
textured
timber
tracery
tree
trunk
unclean
unsanitary
wall
wood