In a bowl, combine flour and salt. Add half of your water and mix all ingredients together (use a spatula or a mixer with the dough hook). Gradually add water and continue mixing the ingredients until you get a hard ball of dough that isn't sticky. (Add more flour if it's too sticky.)
Slightly flour your working surface and knead the dough for a minute or two. Roll it out to about 1/2 inch thick or less.
Cut out the desired shapes and transfer them on a baking sheet, covered with baking paper. Cut out the smaller holes (for hanging the ornaments) with a straw (just firmly press it into the dough).
Put the ornaments into the oven, but don't fully close the oven door. I let mine slightly opened. This is important because we are drying the ornaments. If the oven is too hot, they will cook. Let them dry for about 15-20 minutes.
Turn the oven off, flip the ornaments over, close the oven door and let the ornaments in, in case they haven't dried completely. The amount of time needed depends on the thickness of the ornaments. Let ornaments cool, then thread through the twine.
Notes
You can also dry these out in the open overnight, instead of using an oven.