This reminds me of the I Ching (of Man In The High Castle fame, plus y'know, 3000 years of history) approach to decisions, where you ask a question and then receive a random hexagram with a collection of general wisdom. It stimulates thinking around the subject, surprisingly effectively. Both that and the card deck have a lack of causal connection that works in favour of creativity. Brian Eno's Visual Music, which I…
I recall reading about some other musicians that used I Ching - I think John Cage was one of them.
(as seen in Ladies and Gentlemen... Mr. Leonard Cohen)