In open hardwoods you can make like a "cabin". Just get long sticks about the diameter of your arm, select a blind location with at least three trees, and start laying them in there. It takes some time, but you've really got something when you're done. You've got concealment, shelter, and shooting rest. I build my own seat too, get an old rotten piece of log, thicker than your leg, and pile up a few sections, mash them down with your foot until they're the right height and comfortable. Then if you use this blind in subsequent years, you can just add to it.