I bought the stamp at rubberstamps.net. I went with the 3 inch stamp but you can do any size you want. I really like the 3 inch size though and if I have time, I might make my own coasters using it as well. I had a great experience using this company!
Salt Dough Recipe
2 cups All Purpose Flour (don't use bread flour or anything that will rise)
1 Cup fine salt ( I only had flake for the first batch but it didn't work with the stamp so just use fine)
3/4 to 1 Cup Warm Water
Mix the flour and the salt together and then add the water a bit at a time while mixing the dough together. You want it to be like bread dough, not to wet or not too crumbly, you might not need all of the water. Then turn the dough out onto a floured surface and knead for at least 5 minutes!
Once it's well kneaded, roll out your dough to your desired thickness. **I found that if I went too thin, the sides would curl up when drying though, so don't go too crazy.
Then get stamping! I just bought an ink pad in the color I wanted, nothing special, just a normal ink pad. To be honest, the stamping bit was the hardest part for me! I definitely had some go into the trash! But no big deal.
When you are done stamping, cut out your shapes (I used a cup) and poke a hole in the top. Then set them out to dry. I put mine out in the sun on parchment paper and kept turning them over every hour or so. Don't put them in the oven, they will puff up even on low heat! I eventually got a bit impatient and put them in my food dehydrator on a low setting and that worked just fine too. Make sure either way that you let them dry completely! It might even take a day or so, just make sure not to leave them outside over night or they will get too damp! I learned that the hard way!
I think each full batch made me about 20 ornaments give or take.
After they have dried, I sprayed them with varnish. I bought both the shiny varnish and the matte, in the end I preferred the matte. You do need to varnish them though otherwise they will take on moisture and be ruined.
I then glued a few rhinestones on them but you don't have to of course! If you want you could even brush a bit of elmer's glue and add some glitter or just leave them as is.
That's it! A bit time consuming but still easy and cheap!