Similar work, need broad areas to break up outline.
3 base colors, 2 close to backdrop, one close to 'usual freakish backdrop' (like tree)
6 color desert:
Grassland Camo (brassflage):
Base camo patterns on fractals, like Marpat, where you can't tell if it is a small cloud very close, or a large cloud far away. broad stripes hide at distance (realtree, etc. turn to brown outlines), and small patterns over broad stries break up outline at close range. The AR (second pic) turns nearly invisible when set on or within 20 feet of South Dakota Grassland.
However, the job done on Bookhound's shows excellent ability! I am not hacking on it. There is a large difference between 'looking neat' and 'effective'. 6 color desert (choco-chip, 1st pic) is the closest that matches both. Effective is 2nd pic. I can give links and pointers to camo study and chaos/fractal theory for those interested, IM Me.