Sadly, there's not much ice-types that I actually like.
Of those that I do, I'd say Kyurem would be first on my list. It's banned to Ubers, so I rarely get to use it competitively, which sucks, but in terms of design, I think it looks very unique. It's got an intimidating look on its face, which, I believe, goes along with its overall theme pretty well. Plus, it's got two, separate forms to counter Zekrom and Reshiram, respectively, which makes it even more special in my eyes.
After this, comes Abomasnow and Walrein. I'm not exactly sure which I like better, as they're both good when it comes to battling and whatnot. Usually, I pair them up together, and they never cease to wreak some major damage.