Guidelines: Anything goes as long as you're intending to make music with it: bought, borrowed, found, stolen, instrument, gadget, object, score and so on.
To kick it off, my most recent grab has been a pair of these:

which seems to finally have solved the problem of transducer availability on this side of the atlantic. They're littler than the rolen star model, but a good deal cheaper too. Just fixed them beneath the piano this afternoon...






