2D Background Generator

Hey guys,

I'm wondering if it's possible to implement a 2D Background Generator where the background image is randomly selected from an array. I could have just created a long texture for the background, but I want the background to be different each time the game is played. This is the script I have so far:

 using UnityEngine;
 using System.Collections;
 
 public class BackgroundGenerator : MonoBehaviour 
 {
     public float scrollSpeed = 0.5f;
     private Vector2 savedOffset;
 
     //Use this for initialization
     void Start () 
     {
         savedOffset = renderer.sharedMaterial.GetTextureOffset ("_MainTex");
     }
     
     //Update is called once per frame
     void Update () 
     {
 
         #region Scrolling Texture
 
         float y = Mathf.Repeat (Time.time * scrollSpeed, 1);
         Vector2 offset = new Vector2 (savedOffset.x, y);
         renderer.sharedMaterial.SetTextureOffset ("_MainTex", offset);
 
         #endregion
     
     }
 
 }