Ah yes the old..."unknown camo" trick
(the last picture was a photo of the bark of a London plain tree turned 90 degrees).
it would work in a mostly green background but would not break up the wearer much it would need some
much darker or
much lighter areas to give a "see through" effect as seen on most camo patterns, otherwise it would "blob out" at a very short distance.
"Blob out" = term used to describe the effect of the colours blurring and or joining together to form a solid colour.
(technically the bigger and bolder the pattern the further the blob out distance i.e. patterns lthat have tiny patterns like this:
Note: Niether camos really work here but notice the left ACU Marpat looks more like one solid colour (light grey), but the DPM (right) looks more like it is sliced up and tricks the eye into thinking it could possibly see through.