Global tinting color for all background elements rendered by the GUI.

	function OnGUI() {
		GUI.backgroundColor = Color.yellow;
		GUI.Button(Rect(10,10,70,30), "A button");
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnGUI() {
        GUI.backgroundColor = Color.yellow;
        GUI.Button(new Rect(10, 10, 70, 30), "A button");
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnGUI() as void:
		GUI.backgroundColor = Color.yellow
		GUI.Button(Rect(10, 10, 70, 30), 'A button')