This is a rewarding project for children age 4 upwards.
I had these moulds lying around, but you can buy them online.
I bought a bag of plaster of Paris from hobby craft and mixed 2 parts plaster with 1 part water, in a bowl with a metal spoon.
Pour them into the moulds and let them dry 24 hours
Then un peel the rubber moulding off the hard plaster, ( this is the fun part).
A great item to paint . Then keep it or give as a gift.
I would love to see something you make.