No mention of Eno's Oblique Strategies [0]? I've found them very useful for prompting me to think in different ways, which often leads to something to write about. I set up a little shell script, `strat`, which prints out a randomly selected strategy. I've also started adding my own strategies and tips and reminders to correct routine personal issues (e.g., shut the fuck up and listen). I used to have them printed out every time my shell started up but that led to me ignoring them; now I have to seek them out and often enjoy the result.

[0]: https://en.wikipedia.org/wiki/Oblique_Strategies