I've only been quilting for about 1 1/2 years so I don't have a vast range of experience as some on this Board. In that time, I've only purchase 1 pattern (Bargello) that I am following ... although I guess I'm "out of the box" on this as well if enlarging the pattern from a wall hanging to a lap quilt/throw size counts.
All my other quilts have been my own designs and it's not uncommon for me to start with one idea in mind but alter that idea/design during the piecing. I guess you could say I've only been "in the box" once so far. LOL