Lettering, numbers, pictures that are part of a cookie or cake itself. (It's all one dough).
Addition to 1554: Hilchos Muktzah—Introduction to Part 3;
A few very important points in reference to 'הכנה משבת לחול' (doing an action on Shabbos for a weekday);
More Important Information About Removing Splinters on Shabbos;