I make many natural ground blinds. Some times it is best to go with the Kiss priciple on this (kiss=keep it simple stupid). First play the wind. Find a natural structure you can build on, such as a small tree that has caught tumble weeds; small trees with fallen brances; brush pilles, etc.. You dont want to build up much stuff that was not there the day before, this will tend to spook the deer. Use tumble weeds, branches, grasses, etc to build around the structure. I have also set in tall grass with nothing but my camo. and the natural grass as a cover. As long as you are still, read the deers head when they come in, just about any thing will do. Last year I stalkded a deer for about a mile. I set up to where he would cross in front of me. I didnt judge his movement very well, because when he came out of the brush, he was only 50 yards from where I was. I was squated down on a dirt road in plain sight. I simple stayed as still as posible. When he looked away I set my gun and then took the shot.

One last thing, which is very important, Make sure you have something behind you. Breaking up your pattern is one of the most important things.