Seriously apple, this was not well executed. Just like many others commenting here, I really like having live pictures on my lock screen. What makes it worse, is that it seems the slightest touch on the lock screen throws it into Customize mode. it was never that easy to get the live picture to activate! And then it gets worse, if you actually DO want to customize it, the "Done" button doesn't actually complete the change, it takes you to another popup where you have to make an ambiguous choice between making a Wallpaper Pair, or going to Customize the Home Screen?? What? thats really not the typical intuitive apple implementation.
Done should mean Done.
Customizations should be performed in Settings.