So part of GDR2 (or maybe Amber) update was a set of wallpapers, but I have been unable to find them in my pictures hub. Are they located somewhere else, or are they not included on T-Mobile's device?
There's a Background photo album. If you go to the lock screen settings then choose photo, the background album is available. I don't know if that's what you're looking for though.
I'm loving it! This is my second WP8 device and my first flagship (first device was a 521). The build quality on this phone is second to none, it's fast, the screen is vibrant and huge (this is the largest-screened phone I've ever owned and I love it. Perfect size). No regrets.