SYRUP BOTTLE. The bottle with which Walter Cunningham Jr. "drowned his dinner in syrup" would be a good reminder for the lesson that Calpurnia taught Scout that day. Cal in no uncertain terms declared that
"... anybody sets foot in this house's yo' comp'ny, and don't you let me catch you remarkin' on their ways like you was so high and mighty!" (Chapter 3)
CRACKLIN' BREAD. One of Scout's favorite foods is the Southern favorite, cracklin' bread (cornbread with crackling--crispy, fried pork skin), and Cal bakes it for her as a peace offering in Chapter 3.
APRON. Cal's most common bit of clothing in the Finch house is her apron, a symbol of her domestic responsibility.
OCTAGON SOAP. When Cal takes Jem and Scout to the First Purchase Church, Cal first bathes Scout "roughly" and "all over twice" with Octagon and castile--two very strong forms of soap.
PHOTO. Surely Cal would want to include a photo or two, perhaps one of her son, Zeebo, and his children (yes, Cal is a grandmother); or one with herself posing with Atticus, Jem and Scout (and, possibly, even Atticus's late wife).