Some ideas I was entertaining:
A running tally of letters sent to Disney. Also, we could keep our own count of our contributions in our Signatures. I See I2I has taken to this already.
Create a hand-held projector light, with custom 'Tron Lives' slide or projector transparency frame. I'd need a high-powered light, likely with a removable front mount for the transparency and additional lenses which might be needed. They'd have to snap on and off easily, both for carrying and concealment (no need to be too publicly noticeable). Also, a custom leather bag for additional batteries, supplies, and notes. Also, perhaps a blank area under the closing flap for notes of encouragement to the next group, a personal signature.
.... In short, 'paint' a building or two (maybe with some pictures, or fun with fellow Programs), and pass on the Torch to other fans via the mail. Perhaps create a blog for the travels of the Torch of the Uprising. Once it has been passed around to a few willing hands, then perhaps send it to - who? One of the prominent voices of the Tron production team? It would make a great novelty or gift, I think. (I work with leather, so making a custom leather bag wouldn't be a problem; something nice, dark, and durable, with an unobtrusive Identity Disc stylized on the front. Slots for batteries, additional transparencies in case of damage.... Maybe throw in about six 'Mara's Rebels' kerchief masks, just for the sake of having each group take one as a memento?)
Or, a differing idea, sidewalk chalk, and a stencil or two. Easily carried and concealed, no permanent graffiti damage. Safe, quick, and easy to set in public areas. It also has that playful aspect of design.
Custom shirts for Tron groups. Fabric paint and some shirts of choice - bingo, instant sense of identity, personal expression, and fun.
Smaller, individual lights set with with Tron 'T' transparencies. Easily concealed in a pocket, a handful of these could let a small group of Programs go out and have some fun 'painting' targets.