GUISettings.selectionColor

Description

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 ExampleClass : 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);
    }
}