I always pick up pennies, nickels, dimes, quarters. I always pick them up heads up though (I know silly superstition). I'll flip them if they are face down and pick them up
I saw a woman at work one time pick up a couple of pennies off the floor in her office and throw them in the trash. I was in shock and of course had to retrieve them.
I find them a lot at the gym; either around cardio equipment or flat benches.
I always live by the saying "A penny saved is a penny earned"