A little scavenger hunt

[Axer NZ]

So, I was bored, and I decided to play a little game. The first person who figures out the origin of my avatar wins a prize. It's an extremely secret prize, so secret that *cough*banhammerminigun*cough* I won't even reveal what it is until someone wins.

Guidelines
-You are perfectly free to work with other people and to help each other out with solving riddles and such. However, the prize will be given only to the single, first person who sends me a PM with the correct origin in it. Maybe, if I'm feeling nice, the runner-up will get a tank.

-Everyone only gets one try at making their official guess by PM. You're wrong, you're out.

-At certain points, I'll give out clues. Of course, due to my devious nature, these clues are likely to be in the form of riddles or ciphers. Or enciphered riddles, or riddled ciphers... you never know.

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Clues
The all-important first clue:
KXYNBAAWWINEEUXNQBP

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[Revoltion]

I've submitted my guess.

[Axer NZ]

Well, Revoltion's just too smart for his own good, so I'm going to restart with a different picture. If anyone really wants to decode the code, go ahead, but it's pointless now.

[acer5200]

WHAT FLIES ALL DAY BUT STAYS IN ONE PLACE

And to think I told him the damn code!

Nice Caeser Cypher though

[Revoltion]

Hehe, I get a prize.

Well, Revoltion's just too smart for his own good, so I'm going to restart with a different picture. If anyone really wants to decode the code, go ahead, but it's pointless now.

Sounds like I'm getting whacked.

[Axer NZ]

Anyways, the REAL first code is up. Happy hunting!

[Revoltion]

Awww its not another caeser cipher.

[Axer NZ]

Awww its not another caeser cipher.

You honestly thought I'd use the same cipher twice? Please.

[KOOPS95]

Sounds like I'm getting whacked.

That's what she said?

[Revoltion]

That's what she said?

That's what you said.