http://www.nexusmods.com/skyrim/mods/41087/?
Probably best one and really only one.
However I don't recommend it. If you don't have a heavy mod list, its probably fine...but it has TONS of scripts if I recall. TONS. If you can't run both Frostfall+Wet and cold, don't get it. If you have those two, remove them if you really want the above mod.
On top of that, the interiors it changes in some places are REALLY ugly. I think it changes some interiors of the barracks (I think the barracks, in the fort/base thing inside solitude) and it looks so damn ugly.
The mod is good in ideas, but its so damn ugly. And some features weren't ever finished, so its a tad weird and buggy at times. But mostly, the things it changes in the gameworld are so ugly. Worse than their vanilla versions...
My advice is to skip it. I really wanted it in my previous load orders, but it just isn't that good of a mod...even if it should really be in the base game...it just wasn't worth it. That and it was updated a long time ago, and so is bound to have TONS of errors and dirty edits and all kinds of things.
Your likely to end up with an unstable game.
Also, the other become a king mods are exactly similar, except less ugly (so there is that)...all of them decrease stability A LOT and cause tons of performance issues.