Unless you are planning to mass produce any one quilt pattern, I am pretty sure you are ok, making and selling them. I have been to various shows and quilt shops where they have (for instance) an Irish Chain quilt. Jenny shows us how to make one, but she doesn't own the right to that pattern. (it has been around for over 100 years) Make your quilts guilt free that there will be any ramifications and have fun selling them.