Line in Quilting

I love line. Line is my job. My job is to take a pieced or appliqued top, and sandwich the layers of top, batting, and backing together. Then I do machine quilting to hold the layers together, and to add a decorative element to the quilt. Some of the lines I add are for the purpose of utility, some of the lines I add are for decorative purposes. I have to make the decision of what type of line (straight or curvy?), the quantity of the line (dense or loose quilting?), what is the color of the line (to blend or contrast with the fabric, solid color or variegated, matte or metallic thread?) Are the quilting lines to be a focal design element, or blend into the background and let the pieced design be the star? I have quilted over 2,000 customer’s quilts, and probably a few hundred of my own. No two are the same. The design process starts over every time, and basically boils down to how am I going to use the line that my sewing machine creates to add a design element to a quilt?