Displaying multiple GUITextures On One Camera

Within my game scenario I am collecting items placed around the world. When the player collides with the item, it gets destroyed and a HUD should appear on the screen indicating the type of item they just collected. However, I cannot seem to display any, yet alone multiple GUITextures on the screen when the player collides with the item.

I currently have this script which is attached to the MainCamera of the FirstPersonController:

 public var compassHUD:GUITexture;
 public var torchHUD:GUITexture;
 public var gunHUD:GUITexture;

 public var compassTexture:Texture2D;
 public var torchTexture:Texture2D;
 public var gunTexture:Texture2D;

 function Start() {
         compassHUD.enabled = false;
     torchHUD.enabled = false;
     gunHUD.enabled = false;
 }

 function Update () {

     if(!String.IsNullOrEmpty(rotatePrefab.collisionObj)){
     
         switch(rotatePrefab.collisionObj){
             case "compass":
                 Debug.Log("Compass ENABLED");
                 guiTexture.texture = compassTexture;
                 compassHUD.texture = compassTexture;
                 compassHUD.enabled = true;
                 break;
             case "gun":
                 Debug.Log("Gun ENABLED");
                 guiTexture.texture = gunTexture;
                 gunHUD.texture = gunTexture;
                 gunHUD.enabled = true;
                 break;
             case "torch":
                 Debug.Log("Torch ENABLED");
                 guiTexture.texture = torchTexture;
                 torchHUD.texture = torchTexture;
                 torchHUD.enabled = true;
                 break;
         }
     
         rotatePrefab.collisionObj = null;
 
     }
 
 }