// Modifies only the textField style of the current GUISkin

var style : GUIStyle;
private var str : String = "A string...";

function OnGUI() {
GUI.skin.textField = style;
str = GUILayout.TextField(str);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public GUIStyle style;
private string str = "A string...";
void OnGUI() {
GUI.skin.textField = style;
str = GUILayout.TextField(str);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public style as GUIStyle

private str as string = 'A string...'

def OnGUI():
GUI.skin.textField = style
str = GUILayout.TextField(str)