Lettering, numbers, pictures that are part of a cookie or cake itself. (It's all one dough).
What is the logic behind foods that are made into one piece.
Introduction to Combing or Brushing One's Hair on Shabbos;
Is One Allowed to Clean a Room in a Shul After a Kiddush or שלום זכר (Shalom Zachar), Etc., Even Though Nobody's Going Back...