Don't like the picture that is showcased in your Pictures Hub tile? You know you can change it?
The process is painless and easy. Just go into the Pictures hub and tap/hold the screen above the displayed pictures. A pop-up menu will then appear with two options; "Change Background" and "Change it for me".
If you choose "Change it for me" your background and tile image will be randomly selected from all the pictures on your Windows Phone. Choose "Change Background" and you can browse through you picture galleries to find just the right photo.
Just one more way to personalize your Windows Phone.