The "Sonic Picnic" set by Tony Kemplen, is a series of low tech modular sound generating devices built from Tupperware containers, potentiometers, switches, antennas, and simple circuitry. We're not sure if there is also food inside the containers to give them the ambience of a real picnic, but we'll save that detail for you to discover on your own.
Tony Kemplen's Sonic Picnic
http://blog.makezine.com/archive/2008/06/sonic_picnic_will_make_yo.html