So I was on the forums earlier this week and heard people saying that RIM could really show of the display capabilities if they used something other than the redundant blue background. Well, Engadget.com posted a picture of what appears to be a BB10 Dev Alpha B in a case with a different background. I think it makes the OS look much more complete as opposed to the simple "unrefined" (for a lack of better words) look of the blue background.
Yeah, I think I recognize that wallpaper too... I think Jeff Gadway, one of the BlackBerry product managers, had a nice brick background on his Dev Alpha B. Definitely a wallpaper.