Change Sprite Shown in Editor From Field

I have some simple code wherein a dummy object instantiates something over the network.

Code (CSharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class dummy_networkInstantiate : MonoBehaviour {
6.  
7.     public Object networkPrefab; //the thing to instantiate over the network
8.  
9.     void Start () {
10.         Network.Instantiate(networkPrefab,transform.position,Quaternion.identity,0);
11.         GameObject.Destroy(gameObject);
12.     }
13.  
14. }
15.  

I want the sprite of the object IN THE EDITOR to change based on the object I add to "networkPrefab". This way, I could drag in a bunch of dummy objects into the scene, and assign what they should instantiate, and be able to see it reflected in the scene.

How can I accomplish this?