This is a very useful technique for outdoor displays, especially cemetaries. It gives the effect of a 'ground breaker' prop with much less hassle. If you have a tree stump in your yard that comes about a foot or so out of the ground, take a mask, stuff it, and place it over the tree stump. Next, take an old shirt and put it over the dummy's head as if it had a body and was wearing the shirt. Stuff the shirt with leaves or other things and put some fresh dirt around the bottom and.... Eureka! You have a zombie coming out of the ground that is actually hiding a dangerous tree stump! (hence the name - stumpers)
Another great idea that goes along with this prop is to take the same shirt that the 'zombie' is wearing and tear one of the sleeves off. Tie one end of the sleeve closed, stuff it, and tie the other end. Then, stuff a glove and put it on the end of the sleeve. This makes an arm for the zombie. Place it about a foot away from the body so it looks as if he has managed to get one arm out of the ground. Bury the one tied end with leaves or dirt and now you have an even better stumper. (If you bury the original zombie about up to his shoulders, this technique will look very good.)