In a large bowl combine the 1/2 cup salt and 2 cups flour.
Add the water to the mixing bowl and mix until the dough comes together. You may need to add a little more water or flour, 1 tsp at a time to get the correct consistency. It should be dry enough that it doesn't stick to your fingers or the countertop, but not so dry it's crumbly and cracking.
Turn the dough out onto a clean countertop, kneading for a few minutes.
Use the rolling pin to flatten the dough to about 1/4 inch and then cut out shapes with the cookie cutters.
Use the straw or skewer to poke a small hole in the top of each ornament.
Transfer the shapes to a parchment lined cookie sheet and bake the salt dough for 90 minutes.
Turn the ornaments over and bake for another 30-90 minutes. (or longer if needed). The ornaments should no longer be soft or squishy when done.
Cool slightly, then remove the DIY ornaments from the baking sheet and onto a cooling rack.
After the ornaments have completely cooled (several hours), they're ready to paint. Use acrylic paints to decorate them however you want.
Use several coats of acrylic varnish or mod podge to seal the ornaments once they're dry. This helps to preserve them so they can last for years. Either a glossy or matte varnish will work.
Notes
Most varnishes have harmful chemicals so opt for a non-toxic one.
Store the ornaments in a dry place away from direct sunlight.