I have installed GitHub for Windows recently and am using the git bash prompt - the one thing that is bugging me right now is when I type LS all directories are listed in blue.<
Check if you have the file: %USERPROFILE%\.minttyrc
In that file you can configure the RGB values for console colors.
I use the following to have colors easy to read in a dark background:
BoldBlack=128,128,128
Red=255,64,40
BoldRed=255,128,64
Green=64,200,64
BoldGreen=64,255,64
Yellow=190,190,0
BoldYellow=255,255,64
Blue=0,128,255
BoldBlue=128,160,255
Magenta=200,64,255
BoldMagenta=255,128,255
Cyan=64,190,190
BoldCyan=128,255,255
White=200,200,200
BoldWhite=255,255,255