Gizmos DrawIcon NOT located in Gizmos folder

ok i've been trying to add an Icon for a gameObject, that is NOT located in the Gizmos folder, but in Resources for example.

Is there any way to do that? I can't use Gizmos.DrawGUITexture, cuz it uses Rect, for position, so if i pass the position of the transform, it moves only in 2D plane (There is no input for the Z)...

If you add

    void OnDrawGizmos()
     {
     }

And in Unity you go to "GIzmoz", under Scripts, there is the name of the script, that is drawing the Gizmo. From there i can pick an Icon that is everywhere in the Assets (Not just in Gizmos folder).

So how can i replicate that from code...