The revolution is automated! All you need to get your message out is your finger on the trigger of the Covernomics Graffiti Printer (CGP).
The CGP is a Covernomics created device that prints onto any surface using 7 Arduino controlled spray cans. Combining dot matrix-inspired technology with specialist mtn 360 industrial markers the CGP is able to operate at any angle enabling you to write equally well on walls, floors and even ceilings.
A custom application created in Processing translates your desired message into a series of on/off signals for each of the cans, this is then uploaded to the Arduino and triggered with the simple push of a button.
You can see more images of the CGP and its work on Flickr.
Prior art and inspiration:
Bikes Against Bush
Near Tag Quality