AppleHighlightColor syntax
To get the values for AppleHighlightColor try the following:


Pick your desired color
Get that color's RGB values
Take each value and divide it by 255
Put them into the string in order R G B


So, the color:


Red: 255 => 255/255 = 1
Green: 152 => 152/255 = 0.5960784314
Blue: 89 => 89/255 = 0.3490196078


would end up as:

defaults write NSGlobalDomain AppleHighlightColor -string "1 0.5960784314 0.3490196078"

Be careful, it's the hightlight color only so you don't want to pick something dark as some (all?) apps don't change the highlighted text color - dark highlight color + black text = hard to read.