If you are planning on going to a baby shower or plan to host one in the future, then consider a diaper cake. This is a low calorie cake that the mother can use for the baby. A tricycle cake can be made for either a boy or girl depending on what colors are used. Add some pink or blue if you know the gender of the baby, or create a cake with green and yellow if the gender is unknown. The base of the cake is diapers, but you can add washcloths, rattles, pacifiers and other items that the mom will need for the baby.