This poem is from Hermione's point of view. It's actually fanfiction for "Luna's Year" by michelle31a (at the Schnoogle house at fictionalley), a truly moving H/L fic (it's the "unofficial H/L canon"). I can't hope to do the fic justice, but this is my best shot. It takes place during chapter 22, while Harry and Luna are talking on the roof. You can hit the back button, read my poem and ignore references to things you don't understand, or (this is highly recommended for Harry/Luna shippers) read the story. Then, if you ever want to go back to reading amateur fanfiction, you can read my poem.
Warning: Hermione/Luna gen and Harry/Luna het ahead - don't read it if you don't like it.

Loony Lovegood:

Luna, what colour's your sky?
How can you laugh, what makes you cry?
While I run fast you saunter by
How do you pass me on the fly?

You laugh and trust like there's no hurt
Though you're often attacked
Are you lonely, Loony Lovegood
Despite the way you act?

You seem so strong, taking abuse
So what will make you fall?
Sometimes I wonder if you have
A breaking point at all

Are you near that point right now?
What if you lost your dad?
Would you still be carefree, childlike?
Or finally be sad?

You're still close to your mother
There's a powerful bond
The tie is stronger than mere death
And resides in your wand

Are you okay about her?
How bad was it when she died?
Did you have friends or just your dad?
Were you able to confide?

If you lose him will you go down?
Could it tear you apart?
Would it shatter your light-hearted soul
Or unbreakable heart?

I try to understand you
But don't see how you believe
To trust things first despite all proof
Is what I can't conceive

How can untested faith
Be infinitely strong?
How can you ignore evidence
That tells you that you're wrong?

Sometimes your eyes get bigger
What are you thinking of?
You are a human, just like me
Can loonies fall in love?

Luna, he loves you, I see it
It's time to kiss the guy
I know there are some things that
Even you cannot deny

Did you really take him out
To show him moon fairies?
And tell him about how
You can defy prophecies?

Perhaps believing makes you strong
You really conquered fate
And though you came near death you have
No scars of fear or hate

Luna, you're the best thing
That has happened to him
Keep giving him what I cannot
And brightening what was grim

Believe in him and all his dreams
Help realize his crazy schemes
Prove things aren't always as they seem
You two will make the perfect team.