Frozen hands - using water and disposable gloves
 

Fill some disposable gloves with water .. Firmly twist the top and fasten with freezer ties - or the plastic/metal ties from toy packaging !

Carefully put them into the freezer !!

Once solid, remove the glove gently in front of the children so you show them what with and how you made the icehand :D

Sit the hands upright in some tubs and play hoopla with curtain rings!

Gruesome!!:D

lol, maybe add food colouring and adapt for Halloween!