While I really like the new features in iOS7, I can’t stand some of the icons. My wife says it looks like a toy phone and I have to agree. The icons are too childish. The nasty green gradients really bug me. I found that in the Accessibility settings you can increase the contrast of the screen. They made the dock icons look a little better.
Go to: Settings -> General -> Accessibility -> Increase Contrast
And turn it ON
Here is a screen shot of my home screen with before and after. It does make some of the icons look better in the dock. It looks like the backgrounds are just darkened. Which does seem to help.