// Modifies only the label style of the current GUISkin
var style : GUIStyle;

function OnGUI() {
GUI.skin.label = style;
GUILayout.Label("This is a label.");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public GUIStyle style;
void OnGUI() {
GUI.skin.label = style;
GUILayout.Label("This is a label.");
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public style as GUIStyle

def OnGUI():
GUI.skin.label = style
GUILayout.Label('This is a label.')