Awesome video giving a brief history of each of the nine lantern cores. Most people know about Green Lantern and the Green Lantern Corps, but actually I really like the other corps too. I agree with the video that Sinestro's core of terror is a really cool idea, and Scarecrow is perfect for it.
As for my favorite corps? It's kinda hard because how can you not love the idea of your willpower being your super power? But I think the white ring is pretty freaking awesome too, obviously.
+ Alpha Lantern Corps +
In days of peace, in nights of war
Obey the laws forever more
Misconduct must be answered for
Swear us the Chosen - the Alpha Corps!
+ Black Lantern Corps +
The Blackest Night falls from the skies.
The darkness grows as all light dies.
We crave your hearts and your demise.
By my black hand, the dead shall rise!
+ Red Lantern Corps +
With blood and rage of crimson red,
Ripped from a corpse so freshly dead,
Together with our hellish hate,
We'll burn you all, that is your Fate!
+ Orange Lantern Corps +
What's mine is mine and mine and mine.
And mine and mine and mine! Not yours!
+ Sinestro Corps +
In Blackest day, in Brightest night,
Beware your fears made into light.
Let those who try to stop what's right
Burn like his power - Sinestro's might!
+ Green Lantern Corps +
In brightest day, in blackest night,
No evil shall escape my sight!
Let those who worship evil's might,
Beware my power, Green Lantern's light!
+ Blue Lantern Corps +
In fearful day, in raging night,
With strong hearts full, our souls ignite!
When all seems lost in the War of Light,
Look to the stars, for hope burns bright!
+ Indigo Tribe +
Tor lorek san, bor nakka mur, Natromo faan tornek wot ur, Ter lantern ker lo Abin Sur, Taan lek lek nok -- Formorrow Sur!
In sorrowful day, in misfortunate night,
We help those, who need our might,
With the Lanturn power of Abin Sur,
We rid your misery....with compassionate might!
+ Star Sapphire Corps +
For Hearts Long Lost And Full of Fright,
For Those Alone In Blackest Night,
Accept Our Ring and Join Our Fight
Love Conquers All -- With Violet Light!
+ White Lantern Corps +
In brightest day, in brightest night
Let my ring shine the brightest light
When evil comes I will join the fight
The power of the White Lanterns
Is the strongest might