Here are just a few cake decorating ideas: For Halloween or Thanksgiving, decorate cake like a pumpkin, for Christmas, like a wrapped present, or draw some holly-using green icing, and red icing for the berries
For birthdays-decorate like a speed limit sign, or a candy bar wrapper, or draw lattice work arranged with a few roses on the lattice. For men, using chocolate icing with white swirls with maraschino cherries on top of the swirls.
(Many years ago, I was in the cake decorating business) But as the old saying goes, if you don't use it, you lose it----so I've forgotten some of the stuff I used to do.