We also did this in our Guild last year. The real hit was a small, squeaky (kind of flat) ball that we enclosed in a square - so when they pushed on that square, it squeaked. Another square enclosed small bubble wrap. You can kind of follow the Quiet Books for little children, too. There are good ideas - ex: counting with beads attached to ribbon, shoe strings, button holes and securely attached buttons. Anything that has a 'feel' to it.