I don't 'journal' per se. I do have a notebook that, as I'm constructing most quilts, I put a note as to who it's for, any block modifications; cutting notes; etc. but that is about it. I mostly photograph my quilts for my own purposes but not all.
In fact, as I was prepping scraps/leftovers for a friend I could not remember in which quilt some of the fabrics were used. That is highly unusual for me. She, on the other hand, is excellent about photographing and notating where and how much she gets her fabrics as much of what she uses is from yard sales; thrift shops; donations and she does mostly charity quilting. Mine are mostly gifts.