http://www.anti-theory.com/soundart/circuitbend/
I've talked to a couple people on various other forums who came up with some interesting things " hand-bent" , have'nt seen any posts regarding this topic here.
I'm thinking about picking up something up on Ebay and giving it a go.
Maybe a " Tickle Me Elmo " circuit bent with a 1/4" output coming outta the back of his head?
May try my hand at the Casio SK series.............................