I recently bought a quilt kit for a cute lap-sized baseball themed quilt. Got it at my local quilt shop. It was well-cut, beautifully coordinated - everything good. Then the problems began ... didn't want lap size - wanted twin bed size. So I've been back twice to get more material and now have spent more than if I had just bought two kits in the first place!
So ... buyer beware - if you're going to change up a kit think about how much you'll be changing it before you leave the store!
Or is the lesson - use kits "as is" without monkeying around with them???