Sample for Looking for Overhead at Instruments.

MaterialChanger.cs

using UnityEngine;
using System.Collections;

public class MaterialChanger : MonoBehaviour {
  Material mat;
  // Use this for initialization
	IEnumerator Start () {
		while(true){
			StartCoroutine("ChangeColor");

			yield return new WaitForSeconds(5f);

			StopCoroutine("ChangeColor");

			yield return new WaitForSeconds(2f);
				InstantiateMe();

		}
	}
	
	// Update is called once per frame
	IEnumerator ChangeColor () {
		Debug.Log("Changer run");
		int x = 100;
		for(int i = 0; i < x; ++i ){
			x = UnityEngine.Random.Range(1, 1000);
			switch( x % 5 ){
				case 0:
					renderer.material.color = Color.red;
					break;
				case 1:
					renderer.material.color = Color.blue;
					break;
				case 2:
					renderer.material.color = Color.green;
					break;
				case 3:
					renderer.material.color = Color.black;
					break;
				default :
					renderer.material.color = Color.white;
					break;
			}
		yield return null;
		}
	}
	void InstantiateMe () {
		Debug.Log("InstantiateMe run");
		int x = 5;
		for(int i = 0; i < x; ++i ){
			GameObject go = gameObject;
			Instantiate(go,transform.position,transform.rotation);
		}
	}

}