I don't know if there is an official term for them, but one type of house i would love to see more of is Houses like Coldharbour Surreal estate, or Moon-Sugar Meadow. That is, houses that are basically just an empty field. there are so many large structural Furnishings, like buildings and walls, but a lost of houses don't have room for them, or they don't match the style or environment of the house.
Take for instance, you want to play around with all those Murkmire furnishings you have laying around. if you wanted to build something that matches argonian aesthetics, you'd need a swamp. currently, there are only 3 houses that work for this. Stay-Moist manor somehow doesn't have any water in it, despite having "Moist"
Sin the name, Ample Domicile is really small, not much to build there, and Lakemire Xanmeer is great, but is only rarely available. and there are probably countless other examples of this for the other races too.
So, what I want in housing is more "Blank Slate" houses, but tailored for the different races. For instance, a Swamp for Argonians, or a patch of Desert for Redguards. A snowy field for Nords, Or an ashland for Dunmer. You get the picture.
Make them available on the store at all times, like Moon Sugar Meadow is. Hell, maybe even let us get them from events like Doomchar.