First, the earrings. These were made using the sutton slice technique. If you're interested in learning more about this technique, a Google search will provide you with several examples and some nice tutorials. The trickiest part of this process for me is getting the surface design to stick to the base color. If you work slowly and carefully, the pieces adhere and the result is really lovely. I do not roll the resulting design flat. I prefer to leave the design raised for that "cameo" effect.
The pendants below are designed to look like pieces of Wedgewood, the famous ceramic ware developed by the Josiah Wedgewood, an English pottery maker. The powder-blue color is classic, as is the white raised cameo design. These two pendants were not made with the sutton slice technique. They were made using a technique presented at a workshop by Lynne Ann Schwarzenberg, an outstanding polymer artist.
A third "cameo" approach uses push molds with 2 different colors of clay. This approach has its own characteristics - and challenges. Different looks from different approaches. I imagine there are other methods to achieve the cameo effect in polymer clay that don't require carving. If you find any, please let me know!