I know for someone else to quilt it - the quilting alone can range from a penny and a half per square inch to 3 1/2 cents a square inch depending on how complicated the quilting is.
The material would be the actual cost and whatever you think is fair for your labor. If it's your design and colors you choose, I feel more generous, because I'm practicing something I want to do. If it's completely dictated to me... I would want a higher labor rate.
Hope that helps...