How do I change colour scheme on iphone S4?

Question

I just ran the update on my phone. The green colour scheme for icons etc is vile, just looking at it makes me queasy, the keypad impossible to see in bright light - a catastrophe! How do I change it back to what it was or at least to something that is usuable? It seems a lot of people have the problem, so I'm hoping that there will be an answer somewhere. I cannot really use the phone as is because its too hard too read texts, too hard to see names. All help appreciated.

Answer 1

So, when you said: "The green colour scheme for icons etc is vile, just looking at it makes me queasy", you considered the 3 green icons out of 26 iOS icons to constitute the icon color scheme?? 
When you said "green color scheme for icons" it implied that you saw  all icons as containing green.  Hence, the ophthalmologic recommendation.  That said, I agree with you about the psychedelic quality of the green and red icons - poor choice on Apple's part, but hardly nauseating. 
Did you try the Bold Text and Increase Contrast settings I mentioned?
The folder icons and dock are translucent in that they take on the coloring of the background.  Changing the wallpaper will change their cast.  If you use one of the "dynamic" wallpapers, the folders and dock change hue as the background changes.