there’s a midi-sofa (you’ll find it easily by searching the forum), that controls a pong-game
and I’ve built a “Kontaktstation”, that translates skin-contact between two (or more) people to music (see the Wiki -> userpages -> audiocommander)… but that’s to do with music :9
I can also remember, there’s a wind-controlled midibox around here…
the new speakjet-synthesizer module will be quite exotic, too… but also music related and it’s a work in progress, not yet done…