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.
This piece puts me in mind of the Kalb's dark warriors, tormented by their own souls, gathering in the shadow world, awaiting his command. (The LightBridge Legacy Book III) ✦✥✦ Art credit (?): Assassin's creed artwork - Killer by Yuan