During one of our trial Stalking & Spotting courses last year, this student chose to use a significantly thick piece of brush near the base of an oak.  His choice of color was sublime.  It wasn't until he walked us within a four-foot radius that we were able to find him.  Typically, we discourage the "tree-cancer" position, but this time it most certainly worked!  After coaching the spotters into the position, some of the recommended corrections were to increase the use of highlighting vegetation, double-check the position to avoid silhouetting against the bright green behind, and broaden the drape of the veil over the knee to reduce the identifying shape.  Overall, well done!