Books, according to each other's different periods and moods, can send different books. Be sure to send some books that can stand carving. You need to put some thought into choosing books. If the quantity is not too much, 1-2 books will be enough, and you don't need to buy expensive books with good binding.
Memorial album, find out all the photos between you, don't tell each other, some of them were captured by yourself, if you don't know, you can develop them all, write a sentence below each photo, then buy an album, pack it and buy a gift box for each other.