I've marked quilts this way in the past. Whether it's the name of the quilt, or a dedication in the quilting. Depending on how comfortable you are with FMQ, it's really not much different than signing your name. Practice a couple of times on a practice sandwich, and then go for it. I love the idea that the quilted message will be in your handwriting. I still have birthday cards from my grandmother who passed away when I was 13 back in 1983.. I just love going back and seeing their beautiful script handwriting, it brings memories flooding back and makes her feel so much closer for a time.