Lettering, numbers, pictures that are part of a cookie or cake itself. (It's all one dough).
More Important Guidelines About Using Insecticides or Bug Sprays in a Room;
Moving the Flowers or Plants Put Up in Shul or at Home for Yom Tov or Shabbos;
understanding the Concept of מבטל כלי מהיכנו (Nullifying a Vessel from Its Usage);