Here's one I wrote a long while back...feedback's welcome as an FYI:
Hello, I hope I haven't disturbed your sleep up there.
Please, allow me to introduce myself.
I am your darkest thoughts, your primal base evil.
I am you.
I am the part of you that loves to destroy.
I am the part of you that has no morals or cares.
I am the part that want to just take a mate...and do when them what I please.
I am the real you, whether you admit it or not.
What's that? You say I repulse you?
Hahaha, why would you say such a lie?
When your life's greatest moments, the most memorable time you've had
Were under my direct influence!
People say I should be ignored or destroyed.
But if that happened, life would be meaningless and boring.
Others say I should be given free reighn and total control.
But should that happen, I would surely destroy everything around you.
We need each other to live life to the fullest.
Your control, with my dark desires.
Never let any fool tell you otherwise!
For remember...everyone has someone like me inside them too.
Now, get your rest. I have a big day planned for us in the morning...
Quite neat actually. Blank verse is not very often used for some reason. Do you, per chance, also like to use poetry and songs to express emotions?