adorn, decorate, grace, ornament, embellish, beautify - make more attractive by adding ornament, colour, etc.; "Decorate the room for the party"; "beautify yourself for the special day"

add - make an addition (to); join or combine or unite with others; increase the quality, quantity, zise or scope of; "We added two students to that dorm room"; "She added a personal note to her letter"; "Add insult to injury"; "Add some extra plates to the dinner table"