Preheat the oven to 250º F.
Add the flour and salt to a large bowl and mix until combined. Then, add the water and mix until fully incorporated. Kneed the dough for 3-5 minutes, until it is smooth. If the dough is too dry, add a little more water, and if it’s wet and sticky, add a little more flour. The dough should be soft and easy to work with, but not sticky.
Roll the dough out between 1/8″ and 1/4″ thickness. If the dough is sticking to the counter and rolling pin, you can roll it between two pieces of parchment paper. Then, use cookie cutters to cut out different shapes.
Use a chopstick, fork, or any other instrument to create designs and textures on the ornaments (optional). Then, use a chopstick to create a hole at the top of the ornament.
Place the ornaments on a baking sheet lined with parchment paper. Bake for an hour and a half, or until the ornaments are completely hard and dried out. If the ornaments are on the thicker side, they will need to bake longer, possibly up to 3 hours.
Once the ornaments are completely cooled, paint them with acrylic paint. Let the paint fully dry, then brush on a coat of mod podge to seal it. Brush mod podge onto the back of the ornament as well, whether or not you decorated it. This will help to preserve the ornaments for a long time.
Tie a string through the hole at the top of the ornaments, then hang it on your Christmas Tree!