RE: natural ground blinds?
Look for a deadfall that has a nice fork in it. Position yourself so that you' re able to sit with your back in the fork. It will serve as a nice back rest and you can build up the sides with small branches, leaves, and other natural cover. Depending on how high off the ground the fork is, you may need to sit on something like a rock or a log, so bring your padded seat with you.