Druid Peanut Butter?

I ran across this artwork on WoW Vault called Druid Peanut Butter. I don't quite get it.... Anyone care to enlighten me?

Hmmm, reminds me of.... (was a video of the cartoon that featured the song "Peanut Butter Jelly Time" but the content got removed)

Which of course lead me to....

and....

and of course...

and finally....

There's more but I think I've accomplished my mission and got the song stuck in your head. You can thank me later.