Do you have the iceberg that was given as a prize in AC:HHD?
If not, then... lots of patterns. Snowman carpet (or the ski slope one). Ski slope wall or mountain wall. I'd say western fences and storefronts too. Penguin shirts and maybe pics of penguin villagers. Snowmen. Some of the spruce-looking trees (the indoor ones). Throw in some Mario items and maybe some cabin series.