I've listed 25 different tarp shelter designs to help you get started. Each configuration has its pros and cons and there isn't really a perfect design for all occasions. You'll have to chose the right one depending on your situation or you could just try them all out to test your bushcraft tarp setup skills. Click the image for more info or go to http://rollingfox.com/how-to-make-a-tarp-tent-with-designs
As a Boy Scout, I spent many nights in a trail tent like this. It was usually tied at the peak to a tree rather than to a pole like the one shown. We made and waterproofed our own tents from three strips of muslin. Well, our mothers usually did the sewing.