Easy enough, with the Berserker mastery’s known cold emphasis, alongside chaos emphasis. But there are some skills I keep finding myself hoping will get a cold version to be more readily usable alongside Rune of Hagarrad (especially with that one almost impossible to convert to something else without a Conduit of Runic Whispers). Main desires for now being Blackwater Cocktail (liquid nitrogen?), Grasping Vines (I suppose I generally like “dangerous ground” skills), and Aegis of Menhir. Dare I hope at least two of these will join the Cryonic Possibilities’ ranks?
(Honorable mention to Vire’s Might getting an on-armor cold converter. All we have right now is Alkamos’ Warsword.)