I know this isn't specifically for a kindle, but try out stuff from the
SCP. Just get a primer in how the org works from the Background tab, and then hit the random buttons in the sidebar on the left. Due to being a public thing, it might not work all the time, but when it does work, it works brilliantly.
Here's one that I believe works as a good sample of innovative writing on the site:
http://www.scp-wiki.net/scp-1875.