Preheat the oven to 300 degrees F (150 degrees C).
Combine flour, water, and salt in a large bowl; mix well and knead for 10 minutes.
Transfer dough to a floured work surface and knead until soft and pliable.
See AlsoCornstarch and Dish Soap Slime2-Ingredient Pizza Dough - Plain ChickenHow to Make Cloud Slime | Raising Smart GirlsWhat Is Two-Ingredient Dough & the Most Genius Ways to Use ItRoll out to a thickness of 1/8 inch; cut desired shapes with cookie cutters.
Transfer dough shapes to ungreased cookie sheets; use a toothpick to make a hole in each ornament for hanging.
Bake in the preheated oven until hard, about 30 minutes; allow to cool.
Recipe Tips
You can mix the dough with food coloring before rolling.
Decorate baked dough with poster paints or tube paint when completely cool. Allow the paint to dry, then spray with clear polyurethane on both sides to preserve and use ribbon or yarn pieces to hang.