I actually did some research for a camo article that I was going to submit to Primitive Archer, but haven't had a chance to finish. 
  Most camo hunting patterns I've found tend to be too dark.  Also, at a distance, the small patterns blend together and create a single uniform color that reveals the human shape.  Some hunters advocate using 2 different camo patterns...one for the shirt/jacket and a different pattern for the pants.  That way, the patterns will blend together, but they will blend into 2 different colors, therefore breaking you up at a distance.  I would suggest a lighter camo pattern if you're hunting on the ground.  
Do ya'll think I should still submit that article on camo?