A number of years ago, my dad gave me a penguin shaped piggybank that I've kept ever since, occasionally putting whatever coins I have in it. I designed one myself to practice SolidWorks for a college class when I saw there was a contest going on centered around piggybanks. You can't take the coins back out of it without breaking it, so you will have to save unless you're willing to kill the penguin.
The author marked this model as their own original creation.