The finished decorated clay cab be used in many ways. One of the easiest ways to use the clay is to use a cookie cutter to cut out a shape from the polymer clay and use this as a pretty and unusual card topper. This would also make a great ornament or tree decoration. The clay can also be used to make items of jewelry or other accessories. If the decorated polymer clay is too thin for your chosen project, do remember that you can simply put the decorated polymer clay onto another piece of polymer clay to increase the thickness (this is also a great way to use up scrap clay). When you are happy with the finished item, simply cure it as normal following the manufacturer's instructions.
Experiment and have fun!