The color of the selection rect in text fields.

	// Sets the selection color to cyan
	var str : String = "This is a string with \n two lines of text";
	
	function OnGUI() { 
		GUI.skin.settings.selectionColor = Color.cyan;
		str = GUILayout.TextArea(str);
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public string str = "This is a string with \n two lines of text";
    void OnGUI() {
        GUI.skin.settings.selectionColor = Color.cyan;
        str = GUILayout.TextArea(str);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public str as string = 'This is a string with \n two lines of text'

	def OnGUI() as void:
		GUI.skin.settings.selectionColor = Color.cyan
		str = GUILayout.TextArea(str)