So I was thinking a nice feature could be rain gutters for the roof, they could catch water when it rains and even have an animation of gushing. Placing a rain barrel below would fill it of course. Same for small water towers to place on the roof with a piping system laid out across the roof as a "water heater" in the hotter area's not a good idea in the snow biome of course.
On a more complex note a gargoyle at the end of gutters would be lovely as well.
