I created this:
The Sword, the Dragon, and the Lie, by Alice M. Roelke
I felt it was a big success, because it gave me the courage to write a story I wanted to. I spent time writing and editing, not just second-guessing myself, the story turned out well. At least, I was happy with it. :)
I set free promotion for five days, and 219 people downloaded copies. One of them has now reviewed it (4 stars!!). :)
I probably would never have written this without the challenge to give me a little push, even though it was an idea I wanted to play with. I enjoyed myself, and the story kept surprising me.
Someone has started a regular, off-shoot challenge:
I'd love to participate again, but to be honest, I don't know when I will! Probably not this week. :)