The base of the napkin rings is made of air-drying modelling clay. To cut these out, we first create a template out of cardboard. You only need a small piece of cardboard for this, perhaps you ...

All you need for this project are air-dry clay, a rolling pin ... the U.S., you can get a 2.2-lb pack of DAS Air-Hardening ...

These crafty kits range in price between £10 and £40 with enough air drying clay (no need for a kiln) with enough supply to make at least two vases, trinket dishes, plates or whatever you fancy.