I love vids that spin their narrative styles mostly out of mood and thought association, and there are some truly spectacular vids out there that accomplish this. Though like Laura said above, the vidder him/herself may or may not agree with this categorising - I think it's because sometimes "mood vids" seem to have this negative association attached to them, as though the commentator is accusing the vidder of not thinking enough. I think the best mood vids still all say something quite complex about the subject matter, but the way the narrative is carried out is very fluid and thought-association-y. I'm thinking of, for example, bradcpu's Vertigo (http://bradcpu.livejournal.com/28864.html) and lim's In Exchange for Your Tomorrows (http://kekkai.org/lim//index.html#iefyt). I personally love them when they're done well, though my brain doesn't seem wired to function that way when it comes to my own vids.