That is totally up to you. The binding is, or can be, a part of the total quilt pattern. I often use it for an additional point of contrast. Other times, I just use the same fabric as the border. In the case of a batik border, I may match the color with a fabric that is not as tightly woven. Many of my friends make scrappy bindings, often from the fabrics in the body of the quilt. The effect is good, but by the time I get to the binding, I generally don't want to add to my work.