We made a xyophone using a scratch sensor board and some chunks of cantaloupe! We cut up some cantaloupe into chunks and arranged it on a plate. By touching the clips to the fruit in different places, you can get different sensor values for resistance. That's because the fruit acts like a resistor! You can experiment with lots of things and see what sounds you get. Just try touching the clips to them and see what sensor values you get. We've had fun with different foods like fruits and vegetables, Jello, or macaroni and cheese. Water spilled on a table works great- try smearing it around. You can also try touching the clips to your skin. You can try it with multiple people too: have one person touch one clip, and the other person touch the other, then the two people touch each other. What else could you experiment with? Plants? The water faucet? Finger paint? A pencil drawing on paper? There's more information about the scratch sensor board here: http://info.scratch.mit.edu/Sensor_Boards
