// Tints all GUI drawed elements with yellow.
function OnGUI() {
    GUI.color = Color.yellow;
    GUI.Label (Rect (10, 10, 100, 20), "Hello World!");
    GUI.Box(Rect(10, 50, 50, 50), "A BOX");
    GUI.Button(Rect(10,110,70,30), "A button");
    
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnGUI() {
        GUI.color = Color.yellow;
        GUI.Label(new Rect(10, 10, 100, 20), "Hello World!");
        GUI.Box(new Rect(10, 50, 50, 50), "A BOX");
        GUI.Button(new Rect(10, 110, 70, 30), "A button");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnGUI():
        GUI.color = Color.yellow
        GUI.Label(Rect(10, 10, 100, 20), 'Hello World!')
        GUI.Box(Rect(10, 50, 50, 50), 'A BOX')
        GUI.Button(Rect(10, 110, 70, 30), 'A button')