Daddy and mommy what are your ways to teach your kids how to save money ?

I am planning to copy what my sister did. When my nieces and nephews are 4 years old (and below), they have 1 piggy bank (each), where they put their money (gifts). When they started schooling, my sister bought another piggy bank (see pic). Then, she explained the meaning of each segment and let the kids decide how much money to put for each item.