I haven't done enough quilting yet to have worked up a signature. I recall that the author of one of my FMQ books signs hers with a hand. She made the point that if she was doing work for a customer, she didn't think she should put her name on it, but she still wanted to leave her "mark." She said she can imagine people 100 years from now looking at quilts she's done and wondering about the hand. It looks pretty cool.
With my next project, I'm going to sign it with a cat. It'll be like the one you draw on a steam-covered mirror. Another easy one would be like a baby's footprint. Can't decide which one I like better. Maybe I can combine both and do a paw print. Hmmmmmmmm.