That is where The Gunpowder Plot quest comes into the picture, so to speak. You can pretty much do whatever you want, with a time limit of 10 minutes. It is a perfect place to show off a little creativity, or a little madness.
Galithrea, my poor neglected paladin, was making her way through, and started doodling. First, I tried to do the ":p" from my avatar... it didn't really work out. Then I got the bright idea to go full Horde with it, and do the Horde symbol.
It didn't work on the first go, but eventually I got it to a happy place. I even made my first animated GIF! I hope you enjoy, and I even threw a gallery of my "Uh, that doesn't look right..." images. I apparently wasn't the first to come up with the idea, I found out a few minutes ago (screenshots: The GP Plot), but I did it with style! Enjoy! :p