A musician named Franck Cesarini has put together a rig based on a long, thin wooden washboard. He’s playing it à l’américaine and has it decked out with a small cowbell, a round something-or-other, and a bicycle bell. This thing has a pretty nice sound. I imagine the thimbles are going to tear the wood apart before very long, however.
Mr. Cesarini also appears to be a guitarist.