Oil cans come in a million shapes and sizes. And we're apparently trying to collect them all - one can at a time. They have such personality, I can't help picking them up when we find a good one.
Plus, they're useful. Yes, there is oil in these oil cans! Isn't the little red one cute? (No - I haven't named them. Yet.) Additionally, when you use them, you can pretend to be Dorothy helping the Tin Man. Oil can!