Display pictures in assets folder in random order

Hello,

new to Unity, so I probably made some stupid mistakes, but I'd still appreciate the help.

I want to display all pictures in the assets/resources folder in random order with one second delays. So I thought I could just load their filenames into a hash table with numerical keys and generate a list with numbers equal to the keys at the same time. Then I randomise the list and use the contents to access the hash table, instantiating the pictures as sprites. (The pictures should later be partially occluded, so that's why I'm guessing I can't just work with GUITexture.)

If anyone can point me to an easier way to do this, I'd be grateful, but here's what I have so far (which doesn't do anything - no error, no debug text, nothing). If you could give it a look and tell me what I'm doing wrong, that would be great. Thanks!

 public class SocDistance : MonoBehaviour {
     
     Hashtable picHash = new Hashtable();
     List<int> picList = new List<int>();
     
     public void PicAssign () {
         int i = 0;
         DirectoryInfo dir = new DirectoryInfo("myPath");      // resources path
         FileInfo[] fileamount = dir.GetFiles("*.*");
         foreach (FileInfo fi in fileamount) 
         {
             if (fi.Extension.Contains(".JPG"))                
             {
                 i++;
                 picHash[i] = fi.Name;
                 Debug.Log (fi.Name);
                 picList.Add(i);
             }
         }
     }
     
     public void PicRandom () {
         for (int n = 0; n < picList.Count; n++) {
             int temp = picList[n];
             int randomIndex = UnityEngine.Random.Range(n, picList.Count);
             picList[n] = picList[randomIndex];
             picList[randomIndex] = temp;
         }
     }
     
     IEnumerator Stimulus () {
         int z = picList.Count;
         int y = picList[1];
         
         while (z > 0)
         {
             string pic = (string)picHash[y];
             string picNoext = pic.TrimEnd ('.','J','P','G');
 
             GameObject stimulus = new GameObject();
             SpriteRenderer sr = stimulus.AddComponent<SpriteRenderer>();
             sr.sprite = Resources.Load(picNoext, typeof(Sprite)) as Sprite;
             Debug.Log(picList[1]);
             picList.RemoveAt(1);
             z--;
             yield return new WaitForSeconds(1f);
         }
     }
 
     
     void Start () {
         PicAssign();
         PicRandom();
         StartCoroutine(Stimulus());                    
     }
     
     void Update () {
         
     }
     
 }