// Draws a button with an image and a button with text
var tex : Texture;
function OnGUI() {
    if(!tex) {
        Debug.LogError("No texture found, please assign a texture on the inspector");
    }

    if(GUILayout.Button (tex)) {
        Debug.Log("Clicked the image");
    }
    if(GUILayout.Button ("I am a regular Automatic Layout Button")) {
        Debug.Log("Clicked Button");
    }
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Texture tex;
    void OnGUI() {
        if (!tex)
            Debug.LogError("No texture found, please assign a texture on the inspector");
        
        if (GUILayout.Button(tex))
            Debug.Log("Clicked the image");
        
        if (GUILayout.Button("I am a regular Automatic Layout Button"))
            Debug.Log("Clicked Button");
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public tex as Texture

    def OnGUI():
        if not tex:
            Debug.LogError('No texture found, please assign a texture on the inspector')
        if GUILayout.Button(tex):
            Debug.Log('Clicked the image')
        if GUILayout.Button('I am a regular Automatic Layout Button'):
            Debug.Log('Clicked Button')