Cardboard piggy bank with a surprise inside

What is the meaning of such a piggy bank, what could be a surprise? And everything is very simple, the inner walls of the box need to be pasted with colorful stickers, so that the person to whom it is intended may like.

Next, you should give the piggy bank and when the coin drops at the opening it will wait for a surprise, because there will be not only money, but color images that can please no less.