How can I change the hover color of tools in the UI? How can I change the color or light intensity of tabs that are hovered over in blenders user interface?

For example if I hover over the translate option in the tools tab while in the 3d view, it changes color. How can I customize that color?
In the user settings there is a "themes" tab. Use it to change any colors you see fit!

You can also look around - there are many color schemes to be had!