Come to think of it, my one book has a diagram for a drum thing. It says by tuning the knobs you can get a bongo and other stuff. I've never tried it. It is the Forest M. Mims Getting Started in Electronics. I picked it up at Radio Shack around 10 years ago; I don't think they carry it anymore.
Come to think of it, I think I have the 555 timer one, too. I wish I knew where they both were.