Right now I'm using this one:
electricbopeep - Is there a way to set the background used by the pictures hub, or is that just randomly selected? What's the logic WP7 uses for selecting that?
Originally Posted by red grenadine
hold your finger on the background of the picture hub to change the background manually or have the OS do it for you
As red grenadine said, just tap and hold (it's the equivalent of right-clicking throughout the OS). I don't know what logic WP7 uses to select it. I'm glad it's user-customizable but I wish they allowed you to zoom out when cropping the picture. I changed my Pictures background yesterday and it appears fine in "Pictures" but the top is chopped off on the start screen tile.