I haven't seen this get posted elsewhere, and I think it may fit the bill. Some of us were standing around watching the router cut stuff Weds evening and we started talking about a sign for over the door, which got me looking at the glass block windows, which made me think of a grid array of lights, a la a really low res jumbo tron. We talked about a grid of individually addressable "pixels" for each window. I love the idea personally.
My thought is to make multiple modules something like this that have the elements the size of the windows. I'd like them to be semi-mobile, as we may reconfigure our space and, they could be a good stand alone attraction for community events outside of HF that way.
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Making an in window tetris that could be played either locally, or potentially via the network, and from anywhere was also mentioned.
Does anyone know if message board code for an arduino exists?
I see some youtube videos, but haven't found the code, haven't look for too long yet.
This looks like it would be a good local reference display for testing. (It's 24 x 16)

Tell me your thoughts!