I have done this as individual pinatas using smallish balloons as the form
for the pinata. Kids have made them into clown heads, aliens, fruits, sports
balls, etc... the small size makes it manageable. If you have them ready by
halloween, kids could put the candy they collect into them (at home) and use
them that way, at home and in their own way. Many of my kids didn't want to
smash theirs, but this way they have the option to.