Snowman
Sims are able to make snowmen in The Sims: Vacation expansion pack, if your Sims are on a Winter-themed area on Vacation Island. They were then later introduced in The Sims 2: Seasons.
In The Sims 2, Sims can make snowmen when there is deep snow on a lot. Snowmen reflect the personality of the Sim that creates them, but not extensively, as they can only be good or evil. Sims have limited interaction with completed snowmen, however, penguins occasionally appear on the lot and speak to the snowmen. Snowmen will melt if there is no snow left on the ground. Sims can "Knock over" snowmen, which may cause distress to other Sims in the area.
They will be returning in The Sims 3: Seasons.