How to customize font size and color in Jelly Bean? The combination of small font size, low contrast color schemes (gray on gray), and the erratic operation of the auto-intensity makes the screen difficult to read in many circumstances.  

I like auto-dimming, but I think it follows the wrong curve and is often too dim for the ambient conditions. The only alternative is to disable the automatic function entirely, which still results in often having the wrong brightness.

Can anyone recommend the simplest approach to customizing the font sizes and colors for the JB user interface? I liked Gingerbread's UI, but would prefer stick with the JB OS if the UI could be made more like GB. 

(Phone is Nexus S 9020, Jelly Bean 4.1.2)
You can go to Settings > Display > Font size, to change the size. I'm not sure how to change the color though.