Okay, I confess. I actually finished this some time last year but never got around to posting it. I think I wanted to keep making it bigger (like king size) but after living with it (and napping with it on the couch) I think I'm done.
There is no pattern. I actually saw a picture of one that had been done by someone else. I searched for nearly a month trying to find the designer and I would have happily paid for a pattern, but I gave up and decided to go for it.