Saving money is something that all of us should aspire to. It could be that you want to buy a gift for a loved one, but you cannot get the money for it all at once. Or, perhaps you want to treat yourself to a night out with friends at the end of the month and you want to put money aside for that. One convenient way of doing this is by investing in a piggy bank. These receptacles for putting money in have for many years been associated with children, but the whole piggy bank concept works for adults just as well as it does for kids.