Graham Cracker Crumbs and Butter
Ground Nuts and Butter
Wheat Flour and Butter or Lard (with a little water)
Oat Flour, Butter, and Nuts
Golden Flax, Nuts, Butter, and Oat Flour
When you think about it, a crust is just an additional layer on the bottom of a dessert. It is sometimes also a layer on the top of a dessert. Many people are intimidated by pie crust because they have a crumbly, flaky texture in mind that is difficult to create, especially when it is on the bottom of a second layer that is full of fruit juice or custard. Frankly, the only way to keep a crust from getting soggy is to construct it mostly of ingredients that won't easily absorb moisture.
Of course, the thing that doesn't absorb moisture is oil. So plenty of butter, oil or nuts will do the trick. The place where most people get hung up is in trying to roll out a sheet of pastry that doesn't want to stick together. Forming a sheet of pastry that can be maneuvered is a function of gluten, but glutinous and stretchy is the exact opposite of what we want a crust to be. Because a glutinous crust will absorb liquid like a sponge. One solution is to forget the rolling and simply press the crust mix into the bottom of the pie plate.
The top might be a little easier to roll into a maneuverable sheet because it is smaller in diameter, but crumb crusts on top are also appetizing in appearance and quite delicious. Think Dutch Apple. The crust in the photo of this delicious Pumpkin Creme Pie is made with oat flour, sugar, spices, ground pecans and butter. Oat flour is easily made by putting oat flakes in a coffee grinder. Pecans are also crushed in the coffee grinder. Mix these things together right in the pie plate and press them against the bottom and the sides.
Many years ago, pie crusts were made with a variety of trans fat concoctions, which are certainly impervious to liquids, but they are also pretty impervious to healthy digestion, so these solutions should be relegated to history. A good quality lard, however, is a fine oil for pie crust if you want something traditional. Mix, stir, and handle as little as possible to avoid activating gluten.
For the crusts listed above use 1/2 cup soft butter, and whatever combination of dry ingredients you like or have on hand. You can grind most nuts and seeds in a coffee grinder to get the amount needed for your crust. Add nuts and dry ingredients until you get a crumbly mix that can be pressed easily. Spices and sweeteners can be added at your discretion. Sugars tend to scorch easily, so you might want to be somewhat sparing with these.