Select two contrasting colors of oven-bake polymer clay—such as lavender and cream—conditioning each block by kneading it in your hands until soft and pliable. Roll both clay colors into equal three-millimeter-thick sheets using an acrylic clay roller, cutting each color sheet into uniform one-half-inch square tiles using a tissue blade. Arrange the alternating color tiles side-by-side in a grid pattern on a tile work surface, pressing the edges together gently and rolling a smooth acrylic roller over the assembled grid to fuse the tiles into a seamless checkerboard sheet. Cut out desired shapes from the checkerboard sheet using circle craft cutters or knife tools to form ring dish bases or earring pendants. Place the clay cutouts onto a foil-lined baking sheet and bake in a preheated home oven at 275 degrees Fahrenheit for thirty minutes, allowing the baked pieces to cool completely before sanding and sealing.