The Meaning of Life, the Universe, and Everything.
It really bothers me that snow covers only blocks and not stairs, fences, slabs and everything else.
While there's a mod that has snow cover everything, I think it would be better if this mod was integrated into the vanilla game. It would make snowy landscapes with buildings seem more amazing, in a way. Not to mention, it would make player made maps and vanilla maps seem so much better when snow is covering everything.