// Draws 2 toggle controls, one with a text, the other with an image.
var aTexture : Texture;

private var toggleTxt : boolean = false;
private var toggleImg : boolean = false;

function OnGUI () {
    if(!aTexture) {
                Debug.LogError("Please assign a texture in the inspector.");
                return;
    }
    toggleTxt = GUILayout.Toggle(toggleTxt, "A Toggle text");
    toggleImg = GUILayout.Toggle(toggleImg, aTexture);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Texture aTexture;
    private bool toggleTxt = false;
    private bool toggleImg = false;
    void OnGUI() {
        if (!aTexture) {
            Debug.LogError("Please assign a texture in the inspector.");
            return;
        }
        toggleTxt = GUILayout.Toggle(toggleTxt, "A Toggle text");
        toggleImg = GUILayout.Toggle(toggleImg, aTexture);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public aTexture as Texture

    private toggleTxt as bool = false

    private toggleImg as bool = false

    def OnGUI():
        if not aTexture:
            Debug.LogError('Please assign a texture in the inspector.')
            return
        toggleTxt = GUILayout.Toggle(toggleTxt, 'A Toggle text')
        toggleImg = GUILayout.Toggle(toggleImg, aTexture)