There are many different recipes for salt dough. I am just going to list four.
You can use wheat, rye or white (all purpose) flour. Use regular table salt. You can add wallpaper paste or vegetable oil. Add food coloring or paint/glaze after the drying process.
For simple models;
2 cups flour 1 cup salt 1/2 cup water
For filigree work;
2 cups flour 1 cup salt 100 gram of corn or potato starch 3/4 cup water
For textured models;
2 cups flour 2 cups salt 1/2 cup water
Firm for tiles & plates
2 cups flour 2 cups salt 2 Tbsp. wallpaper paste 1/2 cup water
Knead the dough well, or it may crack or crumble. It is ideal to prepare only as much dough as you can work at one time.
When using fresh dough, you can moisten parts you want to connect at the seams and press them together. But for putting dry objects together, add a little water to the bread dough and use this as your paste.
If possible, shape your dough on a cookie sheet. The back will be smooth and there will be no risk of damage moving the objects to the stove. Wet the cookie sheet with a moist brush. This prevents air bubbles between the dough and the cookie sheet.
Allow 1 hour per 1/4 inch thickness at 170 degrees. So, for a thickness of 1 1/2 inches, leave in the oven for about 6 hours. This is for a light cookie sheet. If using a dark cookie sheet, reduce by 70 degrees.
Test for dryness
Tap on the surface. If it sounds dull, it is still moist inside. If it sounds like hard clay, it is dry.
A few suggestions:
Use cookie cutters to make basice shapes and embellish
Make a twisted or braided wreath
Wrap the dough around an oven proof bowl, and allow to dry on the bowl.
Make tile squares, and apply to a picture frame.
Make Christmas ornaments
Depending on your modeling talent, you can do anything with the salt dough that you can do with clay.