I would like to display computer-driven text on a painted wall [closed]

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http://serverfault.com – With all the tiny LED and "laser"-based devices around, I still can't seem to find one that will hookup via USB or serial and project single color text. Has anyone seen anything like that? Essentially it would be the same as a wall-mounted LED message board, but projected instead of in a box on the wall. (HowTos)