My best advice is keep it natural looking, but use enough cover so that you can move around a little. The few times I use a natural ground blind, I like to make it in a circle around me, with just one small path leading in. That protects me from deer coming in at almost any direction. Just don't make a solid wall. That's something you never see in the woods, and also it's alot harder to pick a spot to shoot out of. I shot my first P&Y buck just sitting on the ground, leaning back against a tree stump. No cover at all between me and the deer. 13 yard shot. Ok, that was damn lucky, I know, but it also goes to show, that when you draw your bow is as important as being completely hidden.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol