First things first. I was shown this trick by Elijah Stormheart and Ronan Ravenshard (and Blaze Mistshard was along for the ride as well).
AND . . . Elijah wanted me to make sure I mentioned that he learned about this HIDDEN HOUSING ITEM from Lail Ghostshade. Lail, you're awesome.
So let's get on with revealing the secret. *rubs hands together*
You need to head to The Cruicible in DragonSpyre and run to the location marked by a green arrow on the map below:
Run into the doorway as Amber is demonstrating below. Press X. Tada!
At first I couldn't get this item. Do you know why? Because my backpack was all full. D'oh. Once I made a spot in my backpack, poof! Success!
We all ran over to Elijah's pad and yelled item of the day.
Then I ran Amber there later in the day so she could show off her own.
Unfortunately, it's been such a long time since I've done one of these items of the day I forgot to say the magic words . . . Photoshop should help:
Actually, I guess that should say Thanks Lail . . . oh well. Hey! That rhymed!