I'll start with a quote from Anna Quindlen, offered up by graphic designer Ali Edwards. Consider it in the context of you, as a writer, or your character, as part of their own world. Who have they been? Who are they going to be?
And from the visual side of things, consider the photography of Jeltje (via Decor8) as a writing exercise. Look over the bulletin board and the office pics. Whose might they be?