ya, it would take a lot of attempts to make it perfect and I like how it isn't either. Seems more spontaneous to me. I do it with long exposure times and a flashlight. Different flashlights will give you different colors and effects.
i think it all has to do with thinking it out beforehand and then making good use of your time while the shutter is open. Sometimes I will have to start a new line and I won't remember where to start it...
haha. i used to be really into drawing as a kid but I was never really that great. I could get by though. Now I focus on photography but this is a nice combination of the two hobbies.
32 minutes? yipes. I have a remote shutter release so I can keep mine open until the battery runs out but that wouldn't make much sense. When I do long exposures that are longer than a few minutes I will use mechanical film cameras because then I don't run down the batteries and don't have to wait for the processing inbetween shots.
i have an ND filter but I don't usually use it for these. I usually just try to pick places that are dark with some light leaking in so that it will look right with a long exposure. If it is too dark then it is boring and if it is too bright it looks sloppy and overexposed.