Well, in my case i designed the space with the idea of renting it. So most things i left are stuff i would not miss (old books, cds, etc).
Since i live in cancun i've left local magazines (stuff with info about malls, beaches, resorts, waterparks, etc) and some pamphlets about the atractions (nightclubs and the like).
outside of those, i decorated with the color blue as concept, thinking of making it feel like the ocean. so decorations in the space are themed around beach, sailing, etc.
I am thinking about getting a mural painted on the outside and an underwater scene on the inside, but it's a "long game" idea.