Cumin and coriander are pretty good together in savory dishes, although I wouldn't use them in sweets. Cinnamon, nutmeg, allspice and ginger are common in sweets in the United States; add ginger and ground black pepper for Chinese Five-Spice Powder or coriander, cumin, and (something else I can't remember) for Lebanese Seven-Spice Seasoning. Cumin and coriander are also in my taco seasoning mix. So many uses for those two, along with others.