public var cursorImage : Texture2D;
public var cursorScale : float = 1;
private var cursorRect : Rect;
function OnGUI () {
GUI.depth = 0;
var m : Vector2 = Event.current.mousePosition;
cursorRect = Rect (m.x,m.y,cursorImage.width*cursorScale,cursorImage.height*cursorScale);
GUI.Label(cursorRect,cursorImage);
GUI.depth = 1;
.... Остальное наполнение гуя ....
}