I had an idea a couple of days ago.
Would love to see it done.
In my room - I have a a little contraption that flashes to the rythm of music.
I was thinking; rip the guts out of that - and make it digital (rather than relying on a mic), and attatch a series of LEDs to it.
Now in the body-works, it has one major difference...
|.......|......|.......|
|.......|......|.......|
|.......|..P..|.......|
|...W.|..E...|..W..|
|...O..|..R..|..O...|
|...O..|..S..|..O...|
|...D..|..P..|..D...|
|.......|..E..|.......|
|____|_X_|____|
Have the LEDs at intervals in the perspex - and so it will end up working like this:
When you play a rhythm - the layer of perspex lights up and flashes along with the rhythm, in whatever colour your LEDs are.
Either that - or just have it so the LEDs turn on when the input jack is connected.
Only problem is - you may need to make a battery section accessable.
I have only one condition if you want to use this idea: Let me see some pictures when it's done