Draw Texture Gizmo

#if UNITY_EDITOR
        private void OnDrawGizmos()
        {
            if (Prefab != null)
            {
                var icon = UnityEditor.AssetPreview.GetAssetPreview(Prefab);
                var matrix = GL.modelview; //Get the current View Matrix

                //Begin Insanity
                GL.PushMatrix();

                //Downscale the previous view matrix by 100
                GL.modelview = matrix * Matrix4x4.Scale(Vector3.one / 100f);

                //Center the icon bounds on the Game Object. Flip the Y-scale because.
                var rect = new Rect(transform.position - new Vector3(.5f, -.5f, 0), new Vector2(1, -1));

                //Upscale the rectangle bounds by 100
                rect.x *= 100;
                rect.y *= 100;
                rect.width *= 100;
                rect.height *= 100;

                //Draw the rest of the Owl
                Gizmos.DrawGUITexture(rect, icon);

                //End Insanity?
                GL.PopMatrix();

                Gizmos.color = Color.green;
                Gizmos.DrawWireCube(this.transform.position, Vector2.one);
            } else
            {
                Gizmos.color = Color.red;
                Gizmos.DrawCube(this.transform.position, Vector2.one);
            }
        }
    }
#endif