Yeah, the other thing about field recordings for granulation is that I break a lot of "rules" of recording. I don't worry about traditional sound quality concerns with source material. I mostly just listen for textures and collect a lot of stuff.
One of my favorite drones came out of a scraping broken escalator in the Montreal metro with a humming heater in the background. It sounded terrible. I only had my iPhone and was on my way to work, so I recorded it walking by, without worrying about mic position, levels or sticking around to get a good take.
Slowed down and tuned down and run through a delay, it sounded amazing. I still believe that the fact that there's no fixed position on the sound adds a whole other level of movement and interest, but with all the delay I put on nobody could probably tell except me.
It's the first thing you head in this track:
http://unlikelyevent.net/track/eponymousJust to be clear, I didn't make that with the OT, though.