Evil idea of the day(2)

We watched a demo of the (. Kinect Sensor with Kinect Adventures!) yesterday. It makes you do pretty extreme motions ( like holding your hand in the air for 3 seconds). Afterwards we got talking about how might do this with jewellery (a ring or bracelet) not image processing.

I realise that Rose's bands she is making for the violin work could be used to prototype some kind of interaction mechanism. High on the low effort stakes but need a good idea

I liked the potter wand
   but would be more impressed if it did Bluetooth or 802.11g or something. So the notion of doing hand gestures to do things ( unlock doors?)  would look cool.

I'm wondering if there is some kind of simple screen? based interaction I could use.

John Frazer had a student Nicola Lefever  who did some great jewellery that you could use to recognise finger movements .