Find a penny pick it up and all day long you shall have good luck
See a penny let it lay and bad luck you shall this day.
There are a lot of variations on this old rhyme and originally the lucky pennies were the ones which were face up. However in my opinion it doesn't matter what the penny is. It's still good luck.
A penny saved is a penny earned
A popular saying that is still applicable. If you see a penny pick it up, don't throw them away. Yes, it takes 100 pennies to make a dollar, 1000 to make $10 and it seems like a waste of time. It is not. Simply keep an old jar somewhere that you drop those pennies into, you don't even need to look at it, just keep putting them in.
One day in the future you may need those pennies and when you count them up you will realize that there was more there than you thought. Even if you don't need those pennies, think of them as an investment, whenever the jar is full take that money and invest in a savings, account, a bond...whatever you can afford. It's not much, but every penny counts.