Since Windows Phone users can't spend a lot of time customizing their OS (instead we live our lives), there's much focus on the lock-screen. We know we change ours every few days (we use Ffffound for inspiration).
Today, Microsoft has announced a partnership with London based graphic designer Levi Freeman and as a result, they've released eight "officially sanctioned" wallpapers to spiffy up your Windows Phone.
The eight images are nature focused so they may not appeal to everyone (we're more into abstract art here). Still, the designs are nice and they're meant to look perfect on your phone. What's more, the images all have a corresponding QR code for easy download (see, not even Microsoft uses Tag). Plus Microsoft notes that they hope more of these collaborations will happen with Levi, meaning we can probably expect different themes in the future--we like that idea. Levi also plans to release desktop versions too.
There's some interesting tidbits about the inspiration for each image and details about Freeman at his site, so hop on over to grab those images and learn a little bit about their origins.
Source: Windows Phone Blog, Levi Freeman's blog