Preheat the oven to 300 degrees F / 150 C (or 220 F / 105 C and bake for 5 hours for a more durable ornament).
Whisk the salt and flour together in a large mixing bowl.
Pour the water in slowly while stirring constantly.
Knead the dough together until it creates a thick consistency similar to that of a pie dough or a bread dough.
Dust the kitchen counter with flour or lay down parchment paper.
Roll out the dough until it is roughly one-eighth of an inch thick.
Cut out or hand make the desired shapes as desired.
Poke a hole in the salt dough ornament with a pencil.
Place the salt dough ornaments on a baking sheet - parchment paper is oven salt if you want to transfer them without disturbing the soft shapes you made.
Bake for 1 hour at 300 degrees F / 150 C, or for 5 hours 220 F / 105 C, until the DIY Christmas ornaments are rock solid.
Remove the salt dough ornaments from the oven, and allow them to cool.
Decorate as desired.