If you have a digital projector, practically any blank surface nearby becomes a canvas for your art. That's the idea behind a fad that's cropped up in the past couple of years. Fans have even begun setting up events to show off the best stuff. Case in point, the Digital Graffiti Festival.
One of the sponsors of the festival is Wowwee, whose upcoming Cinemin Swivel pico projector was introduced at the January Consumer Electronics Show. Wowwee claims the Cinemin will revolutionize watching videos on your media player -- just plug in the candybar-sized projector and watch a movie on a wall. While I'm not sure how applicable the device is to projecting art dozens or hundreds of feet away, just look at Patty Maes' Sixth Sense TED Talk for an idea of how cool close-in projection could be.
For another example of technology interfacing with art, check out Graffiti Research Lab's L.A.S.E.R. Tag concept, which lets you draw on the fly, using a combination of a laser pointer, a web cam and a laptop to let you project your own lettering on to the surface. (See Bre Pettis's awesome Weekend Projects video interviewing GRL and showing how to make your own system.)
