// Add the GUI skins found here to your project:
// http://unity3d.com/support/resources/assets/extra-gui-skins
// And fill s1 with the downloaded skins on the inspector
// Press space to change between added GUI skins.

var s1 : GUISkin[];

private var hSliderValue : float = 0.0;
private var vSliderValue : float = 0.0;
private var hSValue : float = 0.0;
private var vSValue : float = 0.0;
private var cont : int = 0;

function Update() { 
    if(Input.GetKeyDown(KeyCode.Space))
        cont++;
}
function OnGUI() {
    GUI.skin = s1[cont%s1.Length];
    if(s1.Length == 0){
        Debug.LogError("Assign at least 1 skin on the array");
        return;
    }
    GUI.Label (Rect (10, 10, 100, 20), "Hello World!");
    GUI.Box(Rect(10, 50, 50, 50), "A BOX");
    if (GUI.Button(Rect(10,110,70,30), "A button"))
        Debug.Log("Button has been pressed");
    hSliderValue = GUI.HorizontalSlider (Rect (10, 150, 100, 30), hSliderValue, 0.0, 10.0);
    vSliderValue = GUI.VerticalSlider (Rect (10, 170, 100, 30), vSliderValue, 10.0, 0.0);
    hSValue = GUI.HorizontalScrollbar (Rect (10, 210, 100, 30), hSValue, 1.0, 0.0, 10.0);
    vSValue = GUI.VerticalScrollbar (Rect (10, 230, 100, 30), vSValue, 1.0, 10.0, 0.0);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public GUISkin[] s1;
    private float hSliderValue = 0.0F;
    private float vSliderValue = 0.0F;
    private float hSValue = 0.0F;
    private float vSValue = 0.0F;
    private int cont = 0;
    void Update() {
        if (Input.GetKeyDown(KeyCode.Space))
            cont++;
        
    }
    void OnGUI() {
        GUI.skin = s1[cont % s1.Length];
        if (s1.Length == 0) {
            Debug.LogError("Assign at least 1 skin on the array");
            return;
        }
        GUI.Label(new Rect(10, 10, 100, 20), "Hello World!");
        GUI.Box(new Rect(10, 50, 50, 50), "A BOX");
        if (GUI.Button(new Rect(10, 110, 70, 30), "A button"))
            Debug.Log("Button has been pressed");
        
        hSliderValue = GUI.HorizontalSlider(new Rect(10, 150, 100, 30), hSliderValue, 0.0F, 10.0F);
        vSliderValue = GUI.VerticalSlider(new Rect(10, 170, 100, 30), vSliderValue, 10.0F, 0.0F);
        hSValue = GUI.HorizontalScrollbar(new Rect(10, 210, 100, 30), hSValue, 1.0F, 0.0F, 10.0F);
        vSValue = GUI.VerticalScrollbar(new Rect(10, 230, 100, 30), vSValue, 1.0F, 10.0F, 0.0F);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public s1 as (GUISkin)

    private hSliderValue as single = 0.0F

    private vSliderValue as single = 0.0F

    private hSValue as single = 0.0F

    private vSValue as single = 0.0F

    private cont as int = 0

    def Update():
        if Input.GetKeyDown(KeyCode.Space):
            cont++

    def OnGUI():
        GUI.skin = s1[(cont % s1.Length)]
        if s1.Length == 0:
            Debug.LogError('Assign at least 1 skin on the array')
            return
        GUI.Label(Rect(10, 10, 100, 20), 'Hello World!')
        GUI.Box(Rect(10, 50, 50, 50), 'A BOX')
        if GUI.Button(Rect(10, 110, 70, 30), 'A button'):
            Debug.Log('Button has been pressed')
        hSliderValue = GUI.HorizontalSlider(Rect(10, 150, 100, 30), hSliderValue, 0.0F, 10.0F)
        vSliderValue = GUI.VerticalSlider(Rect(10, 170, 100, 30), vSliderValue, 10.0F, 0.0F)
        hSValue = GUI.HorizontalScrollbar(Rect(10, 210, 100, 30), hSValue, 1.0F, 0.0F, 10.0F)
        vSValue = GUI.VerticalScrollbar(Rect(10, 230, 100, 30), vSValue, 1.0F, 10.0F, 0.0F)