RFID friend monsters
This project was presented at the Make fest during EuroOSCON 2006. Unfortunately I lost most of the project when my computer was stolen, so I only still have some low res images.
RFID might also have a lot of practical applications, but it can also be used for entirely useless simple projects. In this project, RFID tags and readers embedded in stuffed monsters helped play crackly pizo speaker sounds when a friend was near.