I just purchased a Nexus 7 for my wife (wish I had one), but I can't get the wallpaper to resize itself to the screen.  My wife wants a picture of our kids as her wallpaper, but we can only see a portion of the picture without scrolling left and right.  I have the same picture as wallpaper on my Galaxy III phone, and my phone automatically resizes the picture.  Is there a way to do it on the Nexus 7.

Thanks