I made this Beehive cake for a cake auction last summer.
I used an 8″ round cake pan for the bottom layer and then a 1.5L glass pyrex bowl for the rounded hive part on top. This is the same way that a lot of Barbie Dress Cakes are made. I frosted it using a piping bag to give it the hive look. I then baked sugar cookies cut out as bees and frosted those. I baked most of them on small wooden skewers or toothpicks. I then inserted them into the sides of the cake. I also attached some just with frosting.