Brandon Sanderson
Hope of Elantris
I'd been itching to write another Elantris story. Because of the nature of publishing, I knew that I couldn't do a sequel to the book at the time, as the Mistborn novels made so much more sense to publish. However, Matisse's project gave me the inspiration that I needed in order to turn my attention back to Elantris. I stopped writing on Mistborn: The Well of Ascension and wrote out this section of the Elantris story.
Because Matisse had inspired me, I decided that I would name a character after her. I also felt that if I was taking the time to write a short story in the world, I wanted to introduce a new character rather than telling the story from Dashe's viewpoint. (As would have been likely had this section ended up in the final novel.) Therefore, it was reasonable to write it from the viewpoint of the character I'd just named after Matisse.
The Matisse in the story doesn't act like the real Matisse. I didn't know the real Matisse; I'd never met her. (Though I did have Pemberly describe her so that I could make the character look like her. Matisse was one of my wife's favorite students, as you might imagine from her doing fantastic projects like the Elantris book.)
After writing the story, I sent a copy with Pemberly to give to Matisse as a gift and a thank you. I can only imagine how surprised she was to turn in a project based on one of her favorite books, then get back a short story written by the author including her as one of the characters in the world. This is the kind of nifty little thing you can pull off once in a while as a novelist, and I just couldn't pass by the opportunity.
(Of course, the fact that I'd just put one of Pemberly's favorite students into a story for her, then let Pemberly give the gift, did not escape me. I can't help but think it got me a few bonus points. After all, we did start dating exclusively just a short time after that. . . .)
Matisse gave us the original Elantrisology book she had made as a wedding gift. She still comes to a lot of my signings, and as far as I can tell is still one of the most awesome people alive. (Though I'm biased toward anyone who says nice things about my books.)