The Debris Hut shelter is a very basic shelter to make if you have access to a lot of branches and leaves. As you can see in the picture below, the frame is basically just a pole leaned against a tree (or stump, rock, etc). Branches or deadwood are leaned against the pole to form a sloped roof.
The shelter is then thatched with leaves, grass, sod, pine boughs, or anything else you can come up with. Whatever you are using, remember to pile it on thicker than you think you need to to waterproof it.
Remember... if you are using either dead branches, leaves, or any other flammable material to build the shelter, you will have to be VERY careful where and how you build your fire.