Let's see, I did a Moon Domain a while back, I'll try to dig it up for reference.
Edit: Nope, I did Winter. Still, I'm sure at least some of it could be of use:
Winter Domain:
Winter Domain spells:
1st: Sleep, Unseen Servant
2nd: Misty Step, Sniloc's Snowball Swarm
3rd: Sleet Storm, Slow
4th: Ice Storm, Storm Sphere
5th: Cone of Cold, Control Winds
Divine Chill: Starting when you choose this domain at 1st level, any cold damage you do to a creature causes that creature's speed to drop by 10 ft. until your next turn.
Touch of the Cold: Additionally, at 1st level you gain the Ray of Frost cantrip if you don'tx already know it. It counts as a Cleric spell for you.
Channel Divinity: Freeze Solid: Starting at 2nd level, when a creature drops to 0 hit points you can use your Channel Divinity to freeze it solid. A frozen creature shatters if it takes damage, dealing 2d6 cold damage to every adjacent creature. If 1d4 hours pass without taking damage, the frozen creature defrosts, unconscious and stable.
Body of Ice: Beginning at 6th level, you gain the ability to turn your body to ice. While in this ice form, you have vulnerability to fire damage, resistance to cold damage, and reduce all non-magical bludgeoning, slashing and piercing damage by half your proficiency.
Potent cantrip
Cloak of Snow: Starting at 17th level, you gain temporary hit points equal to your cleric level after each short or long rest. If you would take cold damage, instead gain that many temporary hit points, up to your cleric level.