Filling:1.Whip cream until soft peaks form. Stir in icing sugar and vanilla and whip until stiff.                                                         2.Unroll the cake when cool, and spread the top with the whip cream.
3.Re-roll, without the towel.
4.Cut a thin slice off of each end of the roll, to make them even.
Icing: 1.Soften butter. Combine all ingredients and beat until 2.smooth and of good spreading consistency.
3.Use the centers of the ends you sliced off the cake to make "bumps on the log": Use a little of the icing to affix the bump to the side of the cake - one on each side.
4.Ice the entire cake with the icing, including the ends and the bumps.
5.Run a fork along the icing so that it resembles tree bark.
6.Sprinkle with icing sugar, and decorate with holly or other  Christmas decoration leaves.