Everyone is talking about all the changes in iOS 7 including the font color, lock screen, status bar and folder changes. One of the things driving me crazy is how iOS 7 decides the font color under the applications on the home screen and bottom application bar.
As you can see above, the application titles on mine are now black. They were white with one of the default backgrounds that I had chosen way back in maybe iOS 5. It seems that iOS 7 picks the predominate color of your wallpaper and then assigns black or white to the font color. That is it. No other choice or option. This is fine on super dark backgrounds when it chooses white. Or the reverse on all white images (like the one I hunted down) and it chooses black.
But for those images that sit somewhere in the middle. Maybe edging is darker and the middle more white. Maybe there is light colors at all the wrong places. No matter what the reason, iOS 7 takes it upon itself to make the decision for you. You can spend more time looking for new backgrounds that work well than just having a solid color background and calling it a day.
I also disike the Parallax feature so I disabled it but you still need the right images. My current site to hit for images is Parallaxize. They are awesome.
Also see the article on What the iOS 7 app update icons mean