The GUITexture attached to this GameObject (Read Only). (null if there is none attached).

	guiTexture.color = Color.blue;

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        guiTexture.color = Color.blue;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		guiTexture.color = Color.blue