Earth bending. Don't like someone? Encase them in several tons of rock to show them who's boss, leaving a 2 inch hole for them to breath. Survival situation? You have shelter in seconds. Heck, you could catch food by trapping an animal and leaving it ripe for the capture. You could make fire by summoning flint and steel out of the ground. You could build a fortress out of nothing.
In my opinion, Toph really didn't use her power appropriately in the show. She could have done so much more.