Lettering, numbers, pictures that are part of a cookie or cake itself. (It's all one dough).
a tray on a high chair; wheels on the bottom of cribs; wheel of a carriage;
Questions About Causing Oneself to Bleed on Shabbos (Part 2);
Is One Allowed to Invite One's Friend for a מלוה מלכה Tonight (After Shabbos) on Shabbos Day?;