One of the main purposes of the 24 hour comic exercise is to demonstrate to yourself exactly what you're capable of in terms of creativity, so it works best if you prepare as little as possible in advance. Turning up with a script and just drawing it - well, you get a comic done which is good, but maybe don't learn as much as you could.
Drawing random words out of a hat and playing New Choice with yourself is definitely the way to go I think. With that in mind, please drop any ideas into the comments here or into the twitter tag #24hrcomicimprov
Not fully formed ideas, I mean single word character traits, genres, objects, moods, happenings, that kind of thing.
Thanks folks. See you tomorrow.