I've been thinking about this some, for a long time.

Currently we have a sign done by a traditional Sign writer (one of our regulars) that we tape to the front of the Korg.

Doesn't look quite as bad as it sounds, but I'd MUCH rather have a "Times Square" kinda dealie (like the one in the link), or even more impressive and unique, a "light sign" as in - the logo projected above us on the wall behind.

Only problem I have is - it needs to be VERY portable and robust.