I mainly do surface forts and try to make them look like "medieval" villages. Houses have usually a workshop and a living area (and a sloped roof).
There's some screenshots (http://www.bay12forums.com/smf/index.php?topic=180131.msg8414370#msg8414370) of the latest village (http://www.bay12forums.com/smf/index.php?topic=180131.msg8423609#msg8423609) in my Waterlures thread (http://www.bay12forums.com/smf/index.php?topic=180131.msg8392011#msg8392011).
(https://i.imgur.com/cEsHDY8.jpg)