Assigning a Sprite to a Script and creating a Gameobject out of that sprite

Hey, I am creating some Scripts to improve the work with unity's 2D-Tools. So I created a Script that changes the Scene-view to a tile-Based editor with snap-grid. And now i have a little t$$anonymous$$ng I want to improve. Right now I create a Game-Object when leftclicking but in the inspector I have to assign a prefab of a gameobject with a sprite renderer on it to tell the editor what object should be created. And I dont want to create a prefab for every Sprite that is in the game. And now i would like to know if there is a way to convert a sprite into an gameobject, because i just want to be able to assign a Sprite in the inspector and afterwards when i left click its creates the gameobject out of t$$anonymous$$s sprite.

Maybe someone knows if t$$anonymous$$s works and can tell me how. If it isnt working that way I am happy if you maybe tell me some other ways to do t$$anonymous$$s. Even if you have a completley different attempt that would work I want to know.

Here my scripts(If you don't know what a special line of the code does just ask):

 using UnityEngine;
 using System.Collections;
 
 public class LevelDesigner : MonoBehaviour {
     public GameObject prefab; // I want t$$anonymous$$s to be a Sprite and not a gameobject
     public Vector2 gizmoPosition;
 
     public float depth =0;
 
     void OnDrawGizmos(){
         Gizmos.DrawWireCube(new Vector3(gizmoPosition.x,gizmoPosition.y,depth), new Vector3(1,1,1));
     }
 }

And the 2nd scripr:

 using UnityEngine;
 using System.Collections;
 using UnityEditor;
 
 [CustomEditor(typeof(LevelDesigner))]
 public class LevelDesignerEditor : Editor
 {
 
         LevelDesigner script;
         Vector2 oldTilePos = new Vector2 (); 
         void OnEnable ()
         {
                 script = (LevelDesigner)target; 
                 if(!Application.isPlaying){
             if(SceneView.lastActiveSceneView != null){
 
             SceneView.lastActiveSceneView.orthograp$$anonymous$$c = true;
             SceneView.lastActiveSceneView.LookAtDirect(SceneView.lastActiveSceneView.pivot,Quaternion.identity);
             
             }
             }
         }
 
         public override void OnInspectorGUI ()
         {
                 
                 script.depth = EditorGUILayout.Slider (script.depth, -5, 5);
             
                 EditorGUILayout.BeginHorizontal ();
                 EditorGUILayout.PrefixLabel ("Tile(prefab)");
                 script.prefab = (GameObject)EditorGUILayout.ObjectField (script.prefab, typeof(GameObject), false);
                 EditorGUILayout.EndHorizontal();
 
         if (GUI.changed)
                         EditorUtility.SetDirty (target);
         }
 
         void OnSceneGUI ()
         {
 
                 
                 Ray ray = HandleUtility.GUIPointToWorldRay (Event.current.mousePosition);
                 Vector2 tilePos = new Vector2 (); 
                 tilePos.x = Mathf.RoundToInt (ray.origin.x); 
                 tilePos.y = Mathf.RoundToInt (ray.origin.y); 
 
                 if (tilePos != oldTilePos) { 
                         script.gizmoPosition = tilePos;
                         SceneView.RepaintAll ();
                         oldTilePos = tilePos;
                 }
     
 
         Event current = Event.current;
         if(current.type == EventType.mouseDown)
         {
             string name = string.Format("Tile{0}_{1}_{2}",script.depth,tilePos.y,tilePos.x);
             if(current.button ==0)
             {
                 CreateTile(tilePos,name);
             }
             if(current.button ==1) 
             {
                 DeleteTile(name);
             }
         }
                 if (GUI.changed)
                         EditorUtility.SetDirty (target); 
         }
 
     void CreateTile(Vector2 tilePos, string name)
     {
          if(!GameObject.Find(name))
         {
             Vector3 pos = new Vector3(tilePos.x, tilePos.y,script.depth);
             GameObject go = (GameObject)Instantiate (script.prefab,pos,Quaternion.identity);
             go.name = name;
         }
     }
 
     void DeleteTile(string name)
     {
         GameObject go = GameObject.Find(name);
 
         if(go!=null)
         {
             DestroyImmediate(go);
         }
     }
 }