Smaller bones will take less. Here is your solution. Use spoons cups etc. for playing. Place on a surface that is easy to sweep up after. Simply close it up and sweep.
Rice however is half the price.
Oatmeal is fun but a bit messier and may cause your floor to be slippery. Rotate the filling now and then to add to the exploration and for sanitary reasons. Invite a stuffed Koala and some friends too. To make this sugary sweet snack, cut the crusts from pieces of white bread. Do not place a top piece on the sandwich.