There is a whole lot of different kinds and styles of rings. The most common is a little silver ball called a barbell. But people have been starting to get more creative. There are ones that hang and some in different shapes like triangles, squares, rectangles. They also have new vibrant colors like bright orange, deep blue, green, yellow, basically any color you want. Belly button rings are made out of nickel, gold, silver, wood, glass, and gem stones. Belly button rings have become a whole new form of jewelry.