A couple months ago I threw the words "my noble phantasm is" into a Markov text generator, and I found the results weirdly evocative. I expanded the text into a short story as an exercise, and wound up liking it so much I posted it on AO3.
I wrote a follow-up to that story called Saber's Mark. It's about three times as long and much more ambitious. I'm really happy with it! It's all original characters, so you don't need to be familiar with any specific Fate/stay night story to enjoy it. (It does assume some basic knowledge of the setting.) I hope you'll take a look!