Polymer clay comes in a number of colors and can be easily mixed to get just the right shade. It can also be fired in a oven over and over again so that you may add different elements to your sculpture. It can be painted with acrylic paints, tinted with shiny mica powders, and antiqued to give it an aged look. Then it can be wet sanded and buffed or coated with an acrylic sealer like Future floor wax to give it a nice shiny finish.
The artists below have obviously mastered the art of sculpting with polymer clay. I've including there Art Fire shop link so that you may see other items by these talented people.
Roly Poly Santa Ornament by Harrison Hollow Designs
Teacher's Pet by Quernus Crafts
Kimi's Jewelry From The Heart
Bear With Blue Roses Necklace by Kimi's Jewelry From The Heart
SteamPunk Dragon Pendant by Fantasy Clay
Sculptured Bird Necklace by Art Visions
Ooak Lighted Pixie Oak Tree House by Creative Critters
Cymbidium Orchid Refrigerator Magnet by Amazing Designs
Grey Tabby Cat Ornament by Amy Crawley