My fiddler cousin Pierre made a footboard he used for foot percussion on French Canadian tunes, like Hangman's Reel or Pointe Au Pic, etc.

It was a piece of 5/8" or 1/2" plywood, roughly 2 feet square and grooved along one side to hold the feet of a chair so it didn't slide away while he was kicking out his rhythms. He had some kind of pick-up (piezo or mic, I don't know for sure) embedded in the board somehere and a 1/4" jack for an output at the top edge of the board. From there, he'd run a patch cord into a DI, then a cable from the DI to the snake or board.

He didn't play around too much with the sound of it. Once he got a "bootheel hitting the floorboard" sound, that was good. It solved a lot of feedback problems that floor mics would cause, because he and his band were pretty picky about their monitor sound.