My opinion: The color scheme of iOS7 looks as if it was designed to appeal to young girls...
...and as such, I won't ever install it on my 4s if it retains this ugly color scheme.
I don't know what the heck Apple is thinking but the new color scheme of iOS7 is terrible. I'm an engineer and I want an interface that looks as if it was designed for an adult. The iOS6 was fine. Why did they have to go and 'fix' it?
Just a rant.