Okumarts Games has their first booster pack for Snowball Wars available over on Wargame Vault: Elf Help.
From the release:
It’s the first fast and furious booster set for the epic battle in a winter wonderland.
Snowball Wars Booster Set One is not a complete game, but adds Santa’s Elves, presents and a Snow Beast to the Snowball Wars minigame. All files are 300dpi and include front and back views.