Changing Textures for a List of Objects

I have a list of objects stored and I want to reset them all through the list. Each of their textures change OnTrigger... and I want to reset them as a whole through the list. How would I call that? I figured a Foreach would be in use, but I dont know the line of code to retrieve the list and reset each member.

 public class BlockControl : MonoBehaviour 
     {
         public static Texture2D            emptyBlock;

         private GameObject[]                brickBlockArray;
         private GameObject[]                questBlockArray;
         
         public static List<GameObject>     brickBlockList;
         public static List<GameObject>     questBlockList;
         
         private int                     count;
         
         void Start()
         {
             brickBlockArray    = new GameObject[count];
             brickBlockList = new List<GameObject>();
 
             foreach(GameObject blockType in brickBlockArray = GameObject.FindGameObjectsWithTag("BrickBlock"))
             {
                 brickBlockList.Add(blockType);
             }
             
             questBlockArray    = new GameObject[count];
             questBlockList = new List<GameObject>();
             
             foreach(GameObject blockType in questBlockArray = GameObject.FindGameObjectsWithTag("QuestionBlock"))
             {
                 questBlockList.Add(blockType);
             }
         }
             
         public static void ResetBlocks()
         {
             //Reset here...
         }
     }