I, Me
The leader of a big rice paddy is standing in the middle of said rice paddy with an umbrella. Who is this wacky leader? Why, it is I. It is me.
Imagine that this leader is you. Be rough about it, because 俺 is the "rougher" version of "I." You should only use it in casual situations or if you're a badass.
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おれ
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Why am I standing in the middle of this rice paddy with an umbrella? I'm digging for ore (おれ).
More accurately, I'm standing here with an umbrella so I don't get wet. My minions are doing the ore digging, but I am watching to make sure they don't slack off.