abstract
aged
annual
backdrop
blue
brown
circle
circular
concentric
cracked
cracks
cross
cut
detail
dried
dry
empty
fiber
forestry
gray
grunge
hard
history
hole
life
log
logging
lumber
natural
nature
old
pattern
plant
ring
round
section
slice
space
split
structure
stump
surface
texture
textured
timber
tree
trunk
wood
wooden