GUI Outline.

http://unity3d.com/support/documentation/ScriptReference/GUI.Box.html

http://unity3d.com/support/documentation/Components/GUI%20Scripting%20Guide.html

http://unity3d.com/support/documentation/Components/gui-Basics.html

http://unity3d.com/support/documentation/ScriptReference/GUI.html

I dont see where can i make "Outline"

if you want a quick box, use GUI.Box instead of GUI.Label . I don't think there is an outline function, so you may have to make textures and use them with GUI.DrawTexture or GUI.Box , then put your GUI.Label over the texture.

 static function DrawTexture (position : Rect, image : Texture, scaleMode : ScaleMode = ScaleMode.StretchToFill, alphaBlend : boolean = true, imageAspect : float = 0) : void 

 static function Box (position : Rect, image : Texture) : void