My son loves weather. He wants to be a meteorologist when he grows up and I know that in time if this is really his calling, he will do it. For his birthday we organized him a personal tour/lecture at the university at the Department of Atmospheric and Environmental Sciences and later at the National Weather Service. It is unnecessary to say he had a blast, heck we loved it too and we are not interested in the weather as much as him.
So for his birthday cake he wished for a "Weather" cake.
Piece of cake!