Make your own custom, miniature plates in colors and designs that will match the existing decor of your dollhouse. The easiest way to make plates that look exactly the way you want is to make them from polymer clay. Polymer clay is hardened at a low temperature in a standard kitchen oven. It comes in many different colors, so you can choose the base color for your plates without having to paint the entire plate. Materials for this project may be found where craft supplies are sold.
Work a block of polymer in your hands to condition, or soften it up with the warmth of your hands and roll it into a ball. Flatten the clay ball on a clean, smooth surface with a rolling pin until the clay is about 1/8-inch thick.
Press the edge of the opening of a plastic soda bottle cap into the clay near one of the edges of the clay to cut a circle through it. Lift the cap up and carefully pop out the clay circle. Do this for as many plates as you want to make. You can also use small, round cookie cutters to cut out the size of plates that you want.
Place a sheet of wax paper onto a cookie sheet and arrange the clay circles on the wax paper. Gently place the tip of your finger or the end of another long, round object into the middle of one of the circles. Lift up the edges of the plate all the way around so that they extend up at a slight angle. Look at a real plate to help guide you in molding it into the right shape.
Bake the miniature plates in a conventional oven, preheated to 250 degrees, for 15 minutes. Remove the cookie sheet from the oven and wait 45 minutes for the clay to cool so you won't burn yourself while handling it.
Paint a delicate design around the edges of the plates with a fine paintbrush, such as a size 000 brush, and acrylic paint. Paint a swirl design or small flowers, like the ones you would see on life-sized plates. Wait one hour for the paint to dry.
Apply a coat of clear, glossy acrylic varnish over the whole plate. Wait two hours for the acrylic varnish to dry before putting the tiny plates in your dollhouse.