This is a pretty neat project from Mauricio Melo (there isn’t a how-to but I think it’ll be easy to replicate) It’s a networked emoticon device. You log onto it through the Internet and let your other significant at home know if something at work or at school has made you happy, sad, so-so, or upset. The devices are connected to the Internet through an Xport controlled by a Microchip that handles the basic communications. A series of switches reciprocally activate four LEDs that light the transparent emoticons. Via WMMNA. Link.
WEB ARE YOU? Networked Emoticon Device