Ah, this q takes me back to my teaching days with Elementary aged kids and the fun times of making all sorts of interesting homemade stuff.
Beans in cans are a standard of course, but rice gives a lovely sound and if done also in a long mailing tube back and forth gives a nice rainfall effect.
You can get rubber bands of all different thicknesses and get a myriad of sounds depending upon how tightly they are stretched over various objects.
All different types of glass bottles can be filled with varying levels of water and pinged lightly with spoons or drumsticks.
With wider bowls or glasses you can lightly wet the tops and run your fingers around to get all sorts of diverse melodic sounds.
Or you could even tune them precisely to a pitch pipe a la Ben Franklins original musical glasses.
For obvious reasons with younger kids, we used sturdier things like mayo or pickle jars made of heavier glass.
The only limits really are your imagination as you just play around with whatever you find in your kitchen or house.
If you really want to take it up a notch you could look up on Hulu or YouTube the performances of a group who made it into the top five on the last season of America’s Got Talent.
They’re a punk group called “Recycled Percussion”.
In addition to the performances, there were some interesting background footage shown accompanying them to a local junkyard and watching them try all sorts of fascinating stuff to make sounds with.
I think you would probably especially like that part. Probably have better luck finding it on Hulu since it’s owned by NBC and ATG is an NBC show.
I’m on iPhone so can’t post links otherwise I would. But I’m sure you’re comp savvy enough to find it :) I think you’ll really enjoy them.