Oooooh, mid century modern, yes please!
Also, I'd love to see a really minimalist style of home, with more windows than walls, and a big enough plot to have some trees for privacy (personally, I don't really mind if that means a smaller house - the old houses are way too big, for me anyway.)
Also, and not strictly house style I know ... but more houses on beaches. Lots and lots of beach houses. Minimalist beach house? Even better.
And also not house style, but I'd love it if they had a corner where it's always winter (I'm weird, I know), as long as the houses there are not all chalets. Or even then...